February 24, the U.S. Supreme Court decides Marbury v. Madison, establishing that the Supreme Court has the power of judicial review and can invalidate acts of Congress that are unconstitutional.
| On March 1, Ohio is admitted as the seventeenth state. |
| On April 30, American ambassador Robert Livingstone and future President James Monroe sign the Louisiana Purchase Treaty, acquiring a huge tract of land of more than 828,000 square miles that covers parts of fifteen present-day states. President Thomas Jefferson announces the treaty to the American public on July 4. |
1804 | On May 14, Meriwether Lewis and William Clark commence the so-called “Lewis and Clark expedition,” heading west from St. Louis. |
| On July 11, Aaron Burr shoots and kills Alexander Hamilton in a duel in Weehawken, New Jersey. |
1806 | Future President Andrew Jackson kills Charles Dickinson in a duel after Dickinson insulted Jackson’s wife, Rachel. |
1807 | On March 2, Congress abolishes the African slave trade. |
1812 | On April 30, Louisiana is admitted as the eighteenth state. |
| On December 12, the U.S. declares war on Great Britain, beginning the War of 1812. |
1816 | On December 11, Indiana is admitted as the nineteenth state. |
1817 | On December 10, Mississippi is admitted as the twentieth state. |
1818 | On December 3, Illinois is admitted as the twenty-first state. |
1819 | On December 14, Alabama is admitted as the twenty-second state. |
1820 | On March 6, President James Monroe signs the Missouri Compromise. It establishes the dividing lines where slavery is legal and illegal. |
| On March 15, Maine is admitted as the twenty-third state. |
1821 | On August 10, Missouri is admitted as the twenty-fourth state. |
1823 | On December 2, President James Monroe delivers his annual message to Congress. In the address, he announces his foreign policy positions in statements that are known as “The Monroe Doctrine.” |
1836 | On June 15, Arkansas is admitted as the twenty-fifth state. |
1837 | On January 6, Michigan is admitted as the twenty-sixth state. |
| On May 10, the Panic of 1837 ensues with the failure of many banks. |
1840 | On May 7, a tornado kills more than 300 people in Natchez, Mississippi. |
| On June 20, Samuel Morse patents the telegraph. |
1845 | On March 3, Florida is admitted as the twenty-seventh state. |
| On December 29, Texas is admitted as the twenty-eighth state. |
1846 | On December 28, Iowa becomes the twenty-ninth state. |
1848 | On May 29, Wisconsin is admitted as the thirtieth state. |
1851 | On June 2, Maine passes the first prohibition law on alcohol. |
1852 | On March 6, the U.S. Supreme Court rules that slaves are property and denies Dred Scott his freedom. |
1853 | On June 24, President Franklin Pierce signs a measure approving the Gadsden Purchase (much of modern-day New Mexico and part of Arizona) from Mexico. |
1858 | On May 11, Minnesota is admitted as the thirty-second state. |
1859 | On February 14, Oregon is admitted as the thirty-third state. |
1860 | On December 20, South Carolina secedes from the Union. |
1861 | On Jan. 29, Kansas is admitted as the thirty-fourth state. |
| On February 9, the Confederate States are formed with Jefferson Davis installed as President. |
| On April 12, Confederate forces fire on the federal garrison Fort Sumter. This is often cited as the beginning of the American Civil War. |
| On April 27, President Lincoln suspends the writ of habeas corpus. |
| On May 8, Richmond, Virginia, is designated as the capital of the Confederacy. |
1862 | On April 16, slavery is abolished in the District of Columbia. |
| On May 19, the Homestead Act is passed. |
1863 | On January 1, President Abraham Lincoln issues the Emancipation Proclamation. It proclaims that all persons held as slaves in the rebellious states are freed. |
| On June 20, West Virginia is admitted as the thirty-fifth state. |
| From July 1–3, the Union army defeats the Confederates at the bloody Battle of Gettysburg. |
| On November 19, President Lincoln delivers the Gettysburg Address. |
1864 | On October 31, Nevada is admitted as the thirty-sixth state. |
1865 | On January 1, Congress approves the Thirteenth Amendment to the U.S. Constitution, which outlaws slavery and involuntary servitude. |
| On April 9, Confederate General Robert E. Lee surrenders to Union General Ulysses S. Grant at Appomattox Court House in Virginia. The Civil War ends a few months later. On April 14, John Wilkes Booth assassinates President Lincoln. |
| On December 6, the Thirteenth Amendment is ratified by the required number of states. |
1866 | On April 9, the U.S. Congress passes the Civil Rights Bill of 1866. |
1867 | On March 1, Nebraska is admitted as the thirty-seventh state. |
| On March 30, U.S. Secretary of State William Seward signs a treaty with Russia to purchase the land that forms the state of Alaska. It is called “Seward’s Folly.” |
1868 | On February 24, President Andrew Johnson is impeached. |
| On May 16, the Senate fails to have enough votes to convict President Johnson of impeachment charges. |
| On May 22, the Great Train Robbery takes place in Reno, Nevada. The perpetrators steal nearly $100,000. |
1869 | On May 15, the National Woman Suffrage Association is formed in New York City. |
1875 | On June 2, Alexander Graham Bell successfully makes the first electronic transmission of sound. |
1876 | On August 1, Colorado becomes the thirty-eighth state. |
1881 | On July 2, President James A. Garfield is assassinated by Charles Guiteau. Vice President Chester A. Arthur succeeds him. |
1882 | On April 3, notorious outlaw Jesse James is shot and killed by Robert Ford. |
| On May 6, Congress passes the Chinese Exclusion Act, ending Chinese immigration. |
1885 | On February 28, The Adventures of Huckleberry Finn is published by author Mark Twain. |
1888 | On May 7, inventor George Eastman patents his Kodak box camera. |
1889 | On May 31, the Johnstown Flood leads to death of more than 2,000 in Pennsylvania. |
| On November 2, North and South Dakota are admitted as the thirty-ninth and fortieth states. |
| On November 8, Montana is admitted as the forty-first state. |
| On November 11, Washington is admitted as the forty-second state. |
1890 | On May 12, Louisiana legalizes the sport of boxing, or prizefighting, as it was commonly called. |
| On July 3, Idaho becomes the forty-third state. |
1893 | The Panic of 1893 begins, highlighted by a severe drop in the New York Stock Exchange. |
1894 | On May 16, a devastating fire in Boston destroys nearly 200 buildings. |
1896 | On January 4, Utah is admitted as the forty-fifth state. |
| On May 18, the U.S. Supreme Court upholds a Louisiana law mandating racial segregation on railways. The Court justifies the law by the so-called “separate but equal” doctrine. |
1899 | On April 10, the U.S. and Spain sign the Treaty of Paris, ending the Spanish–American War. As a result of this treaty, Puerto Rico comes under U.S. control. |
1900 | On April 30, the United States annexes Hawaii. |
1901 | On September 6, President William McKinley is shot by anarchist Leon Czolgosz. President McKinley dies several days later. |
1902 | On May 20, the U.S. ends its military occupation in Cuba. |
1903 | On December 17, brothers Orville and Wilbur Wright complete the first successful airplane flight in Kitty Hawk, North Carolina. |
1905 | On May 15, the city of Las Vegas, Nevada, is founded. |
1906 | A horrific earthquake in San Francisco kills more than 450 people. |
1907 | On November 16, Oklahoma is admitted as the forty-sixth state. |
1909 | On February 12, the National Association for the Advanced of Colored People (NAACP) forms. |
| On April 6, American explorers Robert Peary and Matthew Henson reach the North Pole. |
1912 | On January 6, New Mexico is admitted as the forty-seventh state. |
| On February 4, Arizona is admitted as the forty-eighth state. |
1913 | On May 31, the Seventeenth Amendment, providing for the direct election of U.S. Senators, is ratified. |
1915 | On June 9, Secretary of State William Jennings Bryan resigns his cabinet position. |
1916 | On June 15, the Boy Scouts of America is formed. |
1917 | The
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