The nullification crisis tested whether states could defy federal law

The Civil War permanently strengthened federal power

The Civil War expanded federal power through emancipation, national military mobilization, and postwar civil rights laws, permanently strengthening the national government and shifting the balance of authority away from the states.

McCulloch v. Maryland upheld implied powers and blocked states from taxing the federal government

In 1819, McCulloch v. Maryland confirmed that Congress may use implied powers under the necessary and proper clause and ruled that states cannot tax federal institutions, reaffirming the supremacy of the federal government within its constitutionally delegated powers.

The first test of America's war powers came just a decade after the Constitution was ratified

During the undeclared Quasi-War with France in 1800, the Supreme Court ruled in Bas v. Tingy that Congress had authorized a valid "imperfect war" through statutes alone, without a formal declaration, establishing that there is a legal spectrum between peace and declared war.

Andrew Jackson was the first and only president to eliminate the national debt

After Jackson slashed spending and began selling federal land, the government was accumulating more money than it was spending. The situation was unprecedented, but it didn’t last. Too much money was being printed and land prices rose to unsustainable levels. Within a year, the economy tumbled into a depression.

The Supreme Court ruled in February 2026 that Trump's emergency tariff powers didn't extend to imposing tariffs

In a 6-3 decision, the court held that the International Emergency Economic Powers Act—a 1977 law granting the president authority to regulate commerce during national emergencies—does not authorise the president to unilaterally impose tariffs, a power the Constitution reserves to Congress.

Cases during John Marshall's tenure defined the principles of federal Indian law

During Marshall's tenure, three landmark rulings—Johnson v. M'Intosh, Cherokee Nation v. Georgia, and Worcester v. Georgia—established foundational doctrines of federal Indian law, defining tribal sovereignty, limiting state authority, and placing primary responsibility for Native affairs in the federal government.

In the 1950s, the federal government tried to dissolve tribal nations and end their sovereignty

A federal policy called "termination" withdrew official recognition from more than 100 tribes in the 1950s, cutting off federal services and subjecting reservation land to state taxes and sale.

The Indian Removal Act of 1830 forcibly displaced tens of thousands of Native Americans

Signed by President Andrew Jackson, the act authorized the federal government to negotiate treaties relocating Native nations from their Southeastern homelands to lands west of the Mississippi, often by force.

The Dred Scott decision denied citizenship to people of African descent

In 1857, the Supreme Court ruled in Dred Scott v. Sandford that Black Americans could not be US citizens. The decision heightened an already brewing conflict and became a key factor in pushing the nation toward civil war.

11 states formed the Confederacy, with 2 others claiming allegiance

Between December 1860 and June 1861, 11 Southern states officially seceded to form the Confederacy. Pro-Confederate factions in Missouri and Kentucky also declared secession, but both states remained largely under Union control throughout the war.

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.

Most Confederate soldiers and leaders after the Civil War were pardoned

After surrender, most Confederate soldiers were pardoned and returned home, while leaders like Jefferson Davis faced short imprisonment. The South came under military occupation, Confederate money became worthless, and many former officers were barred from public office.

Congress descended into fistfights, duels, and violence before the Civil War

In the decades before the Civil War, members of the United States Congress carried weapons, assaulted colleagues, and, in one case, a congressman killed another in a duel. The violence was driven largely by sectional conflict over slavery and foreshadowed the nation's descent into war.

Hamilton's tax on whiskey sparked the first armed rebellion against US federal authority

As Treasury secretary, Alexander Hamilton designed an excise tax on whiskey that provoked violent resistance in western Pennsylvania. The Whiskey Rebellion ended when George Washington mobilized state militias under federal authority to enforce the law.

Southern states enacted voting restrictions aimed at circumventing Reconstruction

After 1877, former Confederate states passed poll taxes, literacy tests, property requirements, and grandfather clauses to disenfranchise Black voters—restrictions that remained in place for nearly a century until the Voting Rights Act of 1965.

The Supreme Court blocked states from setting term limits for Congress

In US Term Limits v. Thornton (1995), the Supreme Court struck down state laws that tried to impose term limits on their congressional delegations. The court ruled such restrictions unconstitutional unless added through a federal amendment.

Explore jury nullification, the little-known power that lets jurors ignore the law and acquit anyway

When jurors disagree with a law, they can simply vote to acquit regardless of the evidence; however, this practice is rare, and the legal system actively discourages it. This podcast traces its history from a Quaker prayer meeting in London to the LA riots.

The Missouri Compromise temporarily eased tensions over slavery's expansion

Passed in 1820, the Missouri Compromise admitted Missouri as a slave state and Maine as a free state—maintaining the fragile balance between proslavery and antislavery states in Congress. It also banned slavery north of latitude 36°30′.

The Articles of Confederation were not a federal system

Ratified in 1781, the Articles of Confederation left the states sovereign and independent, denied the national government power to tax or regulate commerce, and forced Congress to act through the states—exposing the limits of confederation and paving the way for US federalism.

Opposing policies over immigration and sanctuary cities define the contemporary debate over federalism

Disputes between the federal government, Republican-controlled states, and Democratic-controlled cities over immigration enforcement and sanctuary policies have become a central flash point in modern federalism. These conflicts will shape the future of state autonomy, federal authority, and the enforcement of national policy across jurisdictions.

Future President Abraham Lincoln challenged Polk’s justification for war with Mexico

As a freshman congressman, Abraham Lincoln introduced the “Spot Resolutions,” demanding President Polk prove that Mexico had attacked on US soil. This constituted Lincoln’s first major political stand and highlighted growing dissent over the war.

When state and local laws conflict, state law almost always prevails

Courts generally side with state law when it conflicts with a local ordinance. Whether the contradiction is explicitly stated or merely implied by the two laws, state authority typically prevails.

The final shots of the Civil War were fired in the Arctic over 2 months after the South's surrender

In June 1865—two months after Lee's surrender—the Confederate raider CSS Shenandoah unknowingly attacked Union whaling ships in the Arctic. When the crew learned the war was over, they sailed 9,000 miles to surrender in Liverpool, England.

A tense standoff with the Teton Sioux nearly ended the expedition

In 1804, the Teton Sioux seized a Corps of Discovery boat during a Missouri River meeting, sparking a dangerous standoff. The conflict eased only after careful diplomacy.

The British Royal Navy—not the US military—enforced the Monroe Doctrine for most of the 19th century

In the early to mid-1800s, the US lacked the ships and military power to prevent European nations from colonizing the Americas. Britain enforced this to protect its commercial interests by keeping rival European powers out of Latin America.

Read the resolutions of the Stamp Act Congress

Adopted October 19, 1765, the resolutions argued that taxation without colonial consent violated the British constitution, that admiralty courts without juries subverted English liberties, and that paying the tax in hard currency was practically impossible. Each grievance was framed not as rebellion but as a defense of rights the colonists already believed they possessed.

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

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

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

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.

The idea for the Federal Reserve was conceived in secret in 1910—with bankers donning duck hunt gear for disguise while traveling to a remote country club on Georgia's Jekyll Island

Mark Twain spent decades feuding with the US Postal Service, convinced its costs and regulations were bureaucratic overreach.

The original copy of the Declaration of Independence is not a pristine document, and even features a smudged anonymous handprint in the bottom left corner.

70 years ago today, city officials in Santa Cruz, California, banned rock 'n' roll to protect its youth from corruption after witnessing a 'provocative' concert the night before.

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

Discover the catastrophic consequences of a failure of the US electrical grid—something that is more likely than many Americans think.

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

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.

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.

Hurricanes, which rely on air consistently spinning in the same direction, cannot cross the equator because air curves in opposite directions north and south of it.

In 1984, Operation Smash Hit intentionally crashed a 239-ton train into a nuclear waste canister at 100 miles per hour to prove the canister's safety, which remained completely intact and lost just 0.29 of its 100 pounds of pressure.

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.

During the French Revolution, a botanist's letter asking about "dear Rhus" (poison ivy) was intercepted, leading authorities to suspect he was conspiring with the Russians.

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.

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

Elk Cloner, the first computer virus to spread in public, was written as a practical joke by Richard Skrenta, a Pittsburgh high school student.

Dirty lightning is a thunderstorm created from friction between rising and falling flows of ash and smoke during volcanic eruptions.

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

Hookworm infection, though risky, may help fight certain autoimmune conditions by tamping down the immune system's inflammatory response.