US History Every Citizenship Applicant Should Know

USCIS calls this section "American History," and it's worth more of the 128 questions than any other single topic. The good news: it's not 300 years of random dates. It's six moments that connect to each other, and once you see the thread, the individual questions get a lot easier to hold onto.

The Colonies and Independence

Britain's 13 colonies along the Atlantic coast grew for over 150 years under English rule before things broke down. The core complaint was simple: colonists were being taxed by a Parliament they had no vote in — "taxation without representation." That grievance is the actual founding idea of the country, and it's why "the American Revolution had many important events. Name one problem that led to it" is one of the 128.

On July 4, 1776, delegates from all 13 colonies adopted the Declaration of Independence, drafted mainly by Thomas Jefferson. It didn't win the war by itself — that took until 1783 — but it's the document that named the idea out loud: that people have unalienable rights, and governments answer to the governed, not the other way around.

Writing the Constitution

The first attempt at a national government — the Articles of Confederation — was too weak to work: it couldn't tax, couldn't maintain an army, couldn't do much of anything. In the summer of 1787, delegates met in Philadelphia and wrote a replacement instead of just patching it: the Constitution, built around three branches of government so no single part could hold all the power.

Even after ratification in 1788, many people worried the federal government could still ignore individual freedoms. The fix, added in 1791, was the first 10 amendments — the Bill of Rights — guaranteeing things like freedom of speech, religion, and the press. That fear-of-power-without-limits idea runs through nearly every civics question about how government is structured.

Growth, Slavery, and the Civil War

The 1800s were the country's fastest and most violent growth spurt: the Louisiana Purchase (1803) roughly doubled US territory overnight, and settlers pushed west for decades after. But the deepest fracture in the country was already there at the founding and never got resolved — slavery. By the 1860s, it split the country outright: 11 southern states seceded, and the Civil War (1861–1865) became the deadliest conflict in American history.

President Abraham Lincoln issued the Emancipation Proclamation in 1863, and the 13th Amendment formally abolished slavery nationwide in 1865 — the actual, official USCIS answer to "Name one problem that led to the Civil War" is simply: slavery. Lincoln was assassinated days after the war ended, but the three amendments passed right after the war (13th, 14th, 15th) reshaped citizenship and rights for the next century.

Becoming a World Power

The 20th century turned the US from a continental country into a global one. It fought in World War I (1917–1918) and, after the attack on Pearl Harbor in 1941, World War II (1941–1945) — allied with Britain, the Soviet Union, and others against Germany, Italy, and Japan. In between came the Great Depression, the worst economic crisis in US history, answered by President Franklin D. Roosevelt's New Deal programs and, according to the official test answer, his leadership through both the Depression and most of World War II.

Civil Rights and the Cold War

After World War II, two things defined the country at the same time. Abroad, the Cold War was a decades-long standoff with the Soviet Union — a conflict of political systems, not direct battles, that shaped US foreign policy until the USSR dissolved in 1991. At home, the Civil Rights Movement pushed to finally make equality under the law real, not just written down. Martin Luther King Jr. led much of that movement through non-violent protest, and the Civil Rights Act of 1964 outlawed discrimination based on race, color, religion, sex, or national origin.

Government Today

The three branches written into the 1787 Constitution are the same three you'll be asked about directly: Congress (legislative, writes the laws), the President (executive, enforces them), and the courts (judicial, interprets them) — each able to check the others, exactly as designed to prevent any one branch from becoming too powerful.

That's the whole arc: a tax dispute becomes a revolution, a failed first government becomes a Constitution built to limit power, a country expands and nearly tears itself apart over slavery, wins two world wars, and spends the back half of the century arguing — and eventually legislating — its way toward the equality it promised on paper in 1776.

• USCIS, "100 Civics Questions and Answers" (2025 revision), M-1778 — uscis.gov/citizenship/testupdates
• National Archives, "America's Founding Documents" — archives.gov
• Library of Congress, "Primary Documents in American History" — loc.gov
• Images: John Trumbull, "Declaration of Independence" (1819); U.S. Constitution, page 1 (1787), National Archives; Abraham Lincoln photograph (1864) — all public domain via Wikimedia Commons; U.S. Capitol dome photograph, public domain via Wikimedia Commons.

Educational content only — not immigration legal advice. Requirements and official test content can change; always confirm current questions at uscis.gov/citizenship/testupdates.