Unconditional birthright citizenship is rare outside the Americas

Birthright citizenship grants citizenship to those born on a country's soil

The United States grants citizenship to individuals born in its territory—excluding the children of foreign diplomats and those born in American Samoa—regardless of their parents' citizenship status. This principle—known as jus soli—was established in the 14th Amendment, ratified in 1868.

Advocates for restricting birthright citizenship argue that some parents aren't 'fully subject to US jurisdiction'

Proponents of limiting birthright citizenship claim that undocumented immigrants and temporary visa holders do not meet the 14th Amendment's "subject to the jurisdiction" requirement, arguing their allegiance remains with another country.

Native Americans were not granted US citizenship until 1924

The Indian Citizenship Act granted citizenship to all Native Americans born in the US, more than 130 years after the Constitution's ratification. Even then, some states continued to deny Native Americans the right to vote for decades.

A poll from May 2025 found that a majority of Americans oppose ending birthright citizenship

As legal challenges progressed, a May 2025 NPR/Ipsos poll showed fewer than one-third of Americans supported eliminating birthright citizenship, despite broader public backing for other immigration restrictions.

Early American citizenship was defined inconsistently by individual states

The original US Constitution did not define national citizenship, leaving it to the states to apply their own rules. This led to inconsistent and often exclusionary standards across the country until after the Civil War.

The Nationality Act of 1790 restricted new citizenship to 'free white persons'

The first federal citizenship law limited naturalization to white immigrants, excluding enslaved people, Indigenous communities, and most non-Europeans.

'Statelessness: Citizens of Nowhere' podcast examines how statelessness erodes identity

This podcast series explores how millions live without citizenship or legal status. Through expert interviews and personal stories, it examines how history, borders, and policy can leave entire populations without citizenship and rights.

US immigrants shifted from primarily originating in Ireland and Germany to Mexico and India

This visualization tracks the top country of birth among US immigrants by state from 1850 to the present, revealing a dramatic shift from European-dominated immigration to today's prominence of Mexican and Indian immigrants.

The US Constitution is widely regarded as the longest-standing written national constitution still in force—see how it has influenced rights worldwide.

The US Constitution has influenced rights and governments worldwide

This interactive tool from the National Constitution Center allows you to compare constitutional rights globally, highlighting which countries have adopted protections similar to those in the US Constitution—and how shared principles manifest in different legal forms around the world.

Western babies often are missing a key gut microbe common elsewhere

Studies show infants in Europe and North America often lack Bifidobacterium infantis, a microbe widespread in babies in Africa and South Asia that helps digest breast milk and train the immune system. Researchers link the gap to antibiotics, formula use, and sanitized spaces.

The rarest blood type in the world

Rh-null, also known as “golden blood,” is a blood type so rare, fewer than 50 people are known to have it. It lacks all 61 Rh antigens, making it a universal donor for rare Rh cases, but a nightmare in emergencies, since only Rh-null can be given back.

The United States is one of only around two dozen countries with a fully federal system of government, in which power is divided between national and state governments.

In the US, you must actively sign up to donate your organs

The US has an opt-in donation system for organ donation—meaning people must provide consent to proceed with any donation. Locations including Spain, the United Kingdom, and Argentina have an opt-out donation system, which means individuals are presumed to be donors unless they actively refuse consent.

Aurea is the first US baby born following polygenic analysis

The child, born in May 2020, was selected by her parents to optimize for certain health qualities based on an analysis of her multifactorial genes by a New Jersey-based company called Genomic Prediction. Her embryo was selected for implantation based on polygenic risk scores for heart disease, diabetes, and cancer.

Child mortality rates since ancient Rome

One of the great achievements of modern humanity has been the sea change in child mortality rates—the chance that a newborn eventually lives past puberty. For thousands of years, children had a 50% chance of not entering adulthood. About 300 years...

Extremely rarely, there can be twins with different dads—but fewer than 20 such cases are documented worldwide

The non-identical twins, who would also be half-siblings, result from a rare biological phenomenon called heteropaternal superfecundation. Britain's first known twins with different dads, featured in this article, learned of each other's existence in recent years, when they were both 45. They discovered each other after taking DNA tests from Ancestry, a genealogy company.

Anthropologists have found that, across the globe, nearly every culture embraces marriage customs

Despite these commonalities, different cultures have distinct customs, such as the number of people who can be married at one time, the types of marriage partners allowed, and whether elaborate ceremonies are observed. Families can range from the smaller nuclear unit to extensive multi-generation families and households.

Americans are projected to inherit $105T over the next 30 years

Today, someone's financial standing has more to do with their families than any other outside factor. Of the more than $100T of projected inheritance, that money is concentrated among a few wealthy estates and families.

How credit scoring works outside the US

If you move outside the US, you won’t get to take your credit score with you. Credit scoring systems work differently in other countries. In the UK, for instance, being registered to vote improves your credit score.

Climate determinism wrongly linked human traits and societal progress to geography

Historically rooted in Greek philosophy, its ideas used the latitudes where people were located to justify racial hierarchies, casting tropical peoples as lazy or inferior. These biases still influence how media and research portray people in climatically disadvantaged regions. (Some readers may experience a paywall.)

The most common birthdays

Nine of the top 10 most common birthdays fall in September, with Sept. 9 being the most common. However, August is the most common birth month, followed by July and December. On the flip side, the least common birthdays are around major holidays, with Christmas Day being the rarest—probably due to doctors scheduling fewer inductions and C-sections on those days. Find out more birthday surprises here.

Jeff Bezos’ adoptive father Mike Bezos immigrated to the US from Cuba at age 16

Mike Bezos’ mother made a coat out of cleaning rags for him before he immigrated, assuming that the United States would be very cold. Mike and Jeff told the story of Mike’s journey to the US and early days in America together in this video.

Native Americans built democratic systems of governance

Indigenous nations, such as the Muscogee, a confederacy of towns in the present-day Southeast, practiced participatory governance centered on communal decision-making and the consent of the governed.

The enduring history of universal basic income

Distributing money to everyone is a radical idea provoking heated debates. The historical record shows pockets of civilizations exploring the notion around the world. The practice resembles what many prehistoric societies did as well. Trace the history of this income distribution approach with this fascinating overview.

The world rapidly decolonized after World War II

After WWII, weakened European powers faced mounting resistance from colonized peoples. Between 1945 and 1980, dozens of nations across Africa, Asia, and the Middle East gained independence.

Mapping Claude's relative usage worldwide, led by Israel, Singapore, and the US

According to Anthropic's AI Usage Index, the US leads in total users, but Israel and Singapore have higher adoption rates among their working populations. Excluding nations with insufficient numbers of conversations for analysis, Tanzania and Angola rank last in the index.

Despite being favored by 87% of Americans, Congress does not have term limits.

44% of Americans say they pray at least once a day—discover how your state's religiosity stacks up against the rest of the country.

The American cockroach is actually from Africa, an apparent hitchhiker aboard ships carrying enslaved people, with evidence suggesting the bug may have arrived in the New World as early as the 1600s.

Bone marrow (soft tissue found inside certain bones) generates roughly 500 billion new blood cells each day

US housing costs have risen by roughly 175% between 1991 and 2026—but a growing number of Gen Zers are becoming homeowners anyway. In 2025, 4% of homebuyers were Gen Z, up from 3% the year before.

One of the most famous portraits ever taken is 'Afghan Girl' (1984) by Steve McCurry, yet the subject Sharbat Gula went much of her life without being identified or benefitting from the image's success.

In 2026, Finland was named the world's happiest country for the ninth consecutive year based on its wealth, social safety network, and high life expectancy, among other factors.

About 2,000 US babies are born annually without some portion of their limbs, potentially leading to a lifetime of pricey prosthetics.

The US first hosted the World Cup in 1994, a tournament that lives in soccer infamy for its poor planning and the murder of Colombian player Andres Escobar, who'd accidentally scored on his own net.

In 2018, 26-year-old missionary John Allen Chau was killed by tribesmen after attempting to reach and evangelize on India's isolated North Sentinel Island

Salvador Dalí believed he was his own dead brother, who had died nine months before he was born

Indefinite cloning of some endangered species may not sustain their longevity because cloning success rates decrease as genetic mutations accumulate.

In preparation for this weekend's Eurovision finale, which is something like the World Cup of pop music, here's a young Céline Dion performing (for Switzerland?) at the 1988 competition.

While El Niño moves warm Pacific Ocean waters east along the equator, La Niña moves them west, shifting where rainfall will become more common for months.

After NASA's Voyager 1 captured Earth as a single pixel as it left the solar system in 1990, astronomer Carl Sagan used the image to reflect on humanity's fragility and the responsibility to protect 'the only world we've ever known.'

Children are now three times more likely to say they want to be a YouTuber when they grow up than an astronaut, with some even attending 'YouTube camps' that teach kids how to create content for the platform.

The 19th-century painters of the Hudson River School were among the first American romantics, with portraits that displayed the natural beauty of the young country.

The word 'jazz' evolved from 'jasm,' 19th-century American slang for 'energy'

While atoms are normally made of protons, neutrons, and electrons, exotic ones have been built with antimatter—alternate versions of normal matter that live for fractions of a second and are about a billion times as rare.

The Great Salt Lake's distinct dual coloration results from high-salinity organisms that only live in the northern portion and produce a purple protein.

Abraham Lincoln was almost assassinated weeks before his inauguration as he traveled from Illinois to DC through Baltimore in 1861; it took two independent claims for Lincoln to be convinced the threat was real

Long before Major League Baseball began allowing instant replay for balls and strikes, an umpire reluctantly used the technology to determine whether a hit was a home run, a move that inadvertently ushered in a new era for the sport.

Poison ivy's rash-causing compound is found in the plant's roots, stem, and leaves—so coming into contact with any part of the plant can lead to rashes for the 85% of people who are allergic to it.