What are some events that affected the US?

Answer 1

Too many to list, but a quick few: The American Revolution, it established the United States as an independent country. The Industrial Revolution, it contributed largely to making the United States a more urban, industrialized nation. The Civil War, it divided the country both figuratively and literally over many issues, many slavery. It resulted in the greatest loss of American life in history, and established America as anti-slavery. Pearl Harbour, it threw America into World War 2, it resulted in millions of American lives lost, the creation of the atomic bomb, and the formation of the Soviet Union. September 11th, it resulted in the downfall of Saddam Hussein, a global recession, and the war in Iraq.

Answer 2

• The Declaration of Independence
• The Revolutionary War
• The Constitution and Bill of Rights
• First Steamboat sails on the Mississippi
• The War of 1812
• Missouri Compromise
• Monroe Doctrine
• The Louisiana Purchase and Lewis & Clark expedition
• The Gadsen Purchase
• Seward's Folly
• The Indian Removal Act and The Trail of Tears
• Mormons attempt to set up the territory and later the state of Desseret
• California Gold Rush
• Congress denies Desseret and sets up Utah and New Mexico Territories
• Civil War
• Gettysburg and the Emancipation Proclamation
• The Assassination of Lincoln
• Navajo Long Walk
• Little Big Horn Defeat of 7th Cavalry
• Reconstruction
• National League (baseball) founded
• The Mexican American War
• Panama Canal
• McKinley assassinated
• NAACP established in NY
• World War 1
• The Teapot Dome Scandal
• Prohibition
• World War 2
• Cold War
• Korean War
• Vietnam War
• Civil Rights Movement
• Assassination of Dr. MLK
• Kent State
• Columbine
• Alfred P Murruh Building
• First Gulf War
• 11 September 2001 (9/11)
• Second Gulf War (Iraqi Freedom)
• War in Afghanistan (Enduring Freedom)
• Election of the first non-Caucasian President, Barrak H. Obama
• Extermination of Osama bin Laden

There are far, far more events that are important. This is by no means a comprehensive or chronologically accurate list.