A timeline of US immigration laws

Track the changes in US immigration law throughout history

This interactive timeline tracks the development of US immigration law, overlaid with time-series data on percentages of the foreign-born population. Explore how each major policy development correlated with immigration levels, revealing the relationship between legislation and demographic change.

Explore the important legislation that has shaped US immigration policy

Read about pivotal immigration legislation from the 1882 Chinese Exclusion Act—the first law restricting immigration by nationality—through DACA, examining how economic conditions, national security concerns, and social attitudes shaped American immigration policy throughout history.

Multiple legal pathways exist for immigrating to the United States

This comprehensive guide outlines various routes to US immigration, including family-sponsored and employment-based visas, as well as humanitarian protections. Navigate the complex American immigration system and understand the options available to prospective immigrants seeking legal entry.

Explore the different experiences of immigrant communities arriving in the US

Immigrant communities experienced varied paths to entry and assimilation in America, depending on their arrival time and context. This Library of Congress resource provides detailed accounts of the experiences of major immigrant groups, drawing on primary sources.

The share of the immigrant population in the US peaked at nearly 16% in January 2025

In January 2025, the US reached a historic high of 53.3 million immigrants—nearly 16% of the population. By June of that year, the number had fallen by more than a million, ending 50 years of continuous growth in the immigrant population.

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 Chinese Exclusion Act was America's first major immigration restriction

The act, signed in 1882, barred Chinese laborers from entering the United States, marking the first significant restriction on free immigration. This overview examines 19th-century Chinese immigration, rising anti-Chinese sentiment, and the diplomatic implications of exclusionary legislation.

A primary source timeline of US history (1600-1968)

Compiled by the Library of Congress, this archive walks through important events in US history through civil rights era, while providing primary sources to explore.

Slavery in the US: a timeline

In 1619, a ship with 20 captives landed at Point Comfort in Virginia, ushering in the era of American slavery. Scroll through this timeline to learn more about slavery in the US and its long lasting effects.

Immigration enforcement shows how federalism plays out on the ground

In recent years, federalism has shifted from allowing policy diversity across states to open conflict, with states and the federal government increasingly trying to impose their preferences on one another over issues like abortion, voting, immigration, and public health.

40% of Americans have ancestors who immigrated via Ellis Island

For over 60 years, Ellis Island was the gateway to America, processing millions of immigrants seeking a new life. While many passed through with ease, others faced rigorous medical exams, legal scrutiny, and even deportation. Learn how this small island shaped generations of American families.

Immigration and Customs Enforcement handles immigration enforcement within the interior of the US

ICE operates inside the United States, enforcing immigration laws through investigations, arrests, detention, and deportation of individuals residing in the country illegally. This page provides an overview of the agency's mission, structure, and internal enforcement operations.

The United States is the world's oldest continuously operating federal system under a written constitution

The US pioneered federalism in the late 18th century, and many countries later adopted federal systems to manage conflict and share power. This resource features interactive maps that trace the spread of federal systems worldwide from 1900 to the present.

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.

Minimum wage laws are a relatively new phenomenon in the US

Today, the federal minimum wage in the US is $7.25 per hour. But the country wasn’t founded with minimum wage laws in its DNA. The first federal minimum wage wasn’t set until 1938, when it was 25 cents per hour.

Interracial and same-sex marriages have both been illegal at certain times during US history

June 12 marks Loving Day, the date when interracial marriage was legalized in 1967. A brave Virginia couple fought back against anti-miscegenation laws, which were finally struck down by the Supreme Court. The Court also ruled for the protection of same-sex marriages in 2015.

Irish music became popular in the US during the 19th century

The influx of Irish immigrants in the mid-1800s, driven by starvation and abysmal employment opportunities, led to a significant Irish-American culture, especially in urban hubs such as New York, Boston, Philadelphia, Chicago, and San Francisco.

How America's cocaine habit fueled its migrant crisis

The United States has been facing a migration crisis along its southern border. Thousands of people have been fleeing their homes in Central America, traveling north through Mexico, and claiming asylum in the USA. Much of this crisis can be traced...

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

Voting in the US has shifted from days-long journeys to modern, secure ballots

In the early 1800s, voting was limited and arduous, often requiring long travel and in-person balloting. This illustrated resource traces how voting technology evolved to expand access, speed elections, and improve security over time.

How the US took half of Mexico

In just two years, the United States redrew the map of North America. Sparked by border disputes in Texas and fueled by President James Polk’s drive for expansion, the Mexican–American War (1846–1848) reshaped both nations.

Explore a timeline of US dependence on crude oil from 1850 to 2023

Oil dependence began with the rise of oil as a commodity, followed by an era of geopolitical competition for the resource after World War II. The domestic fracking boom, which started around 2006, was driven by a desire to reduce the nation's dependence on international adversaries for energy.

US marshals conducted the national census for nearly a century

From 1790 to 1870, US marshals handled the national census, gathering population data from every district. The responsibility was gradually transferred to a separate federal office that would officially become the Census Bureau in 1902.

How the US first installed an electronic fence along the southern border

The US Border Patrol's first automated surveillance system launched in 1970 with 177 ground sensors installed along a single section in California. The sensors had already been used in Vietnam, along the so-called McNamara Line, and were connected by radio transmitters to magnetic-tape computers. They were implemented to target people defined by law and deportable aliens.

Up to 225 cases of leprosy in the US are diagnosed each year

Most cases in the US are imported, meaning someone was infected in a country where it was more common. Since symptoms can sometimes take decades to appear, tracing the origin of the disease can be hard.

The United States has had a tumultuous relationship with Cuba since its 1959 revolution, highlighted by a nuclear crisis and a decades-long trade embargo.

Explore the fraught relations between the United States and Cuba since 1959

From the Cuban Missile Crisis and decades of economic embargo to President Obama's normalization efforts and President Trump's reversion to "maximum pressure," US-Cuba relations have fluctuated between hostility and fleeting diplomacy since Fidel Castro's 1959 revolution.

Hear about the 250-year history of the United States Postal Service, complete with some of its strangest deliveries, important innovations, and the figures that made it an American institution.

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.

Explore an interactive map of battles from the American Revolution, along with detailed summaries of each engagement

While the first exchange-traded fund (a 'basket' of different assets that can be bought and sold on a stock exchange) in the US only launched in 1993, the global ETF market has grown to more than $10T in the short time since.

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.

See this overview of the firework rules across all 50 states, ranging from a complete ban on non-professional fireworks in Massachusetts to states with more lax rules like Indiana.

Jimmy Carter signed a 1978 bill that legalized home brewing, a move credited with kick-starting the craft beer industry.

Calculate how much of your tax dollars go to each federal program based on your income, filing status, and number of children

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

The rivalry between Alexander Hamilton and Thomas Jefferson centered on federalism—the question of how much power the federal government should hold relative to the states.

See the most iconic photos from four decades of LIFE magazine

The story of Dollree Mapp, whose legal challenge over her 1957 conviction for possessing "obscene material" led to a major strengthening of the Fourth Amendment

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.

A 2019 Facebook event called on attendees to "Storm Area 51, They Can't Stop All of Us," resulting in countless memes, the creation of a music festival, and eventually the arrests of those who did try to approach the area.

'Shogun,' a 1980s TV series, helped popularize sushi in the US by stimulating an American interest in Japanese culture.

The Brothers Grimm were lawyers before they were storytellers, but became interested in fairy tales as they began investigating how rules and customs had been passed down through cultures.

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

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

'Grand Canyon of the Yellowstone,' a work by American painter Thomas Moran, inspired Congress to establish Yellowstone National Park.

About 12.5% of US adults experience a phobia in their lifetime, a diagnosis that hinges on the intense fear interfering with daily life and persisting for at least six months.

For centuries, it was common to sleep in two shifts: a few hours at the beginning of the night, and a longer period beginning around midnight

Take a 3D tour of the Hajj, Islam's annual pilgrimage to Mecca, undertaken by more than 1.5 million Muslims each year.