Complete the timeline with the corresponding numbers for key events in American history.

Timeline of important dates in American history with events and corresponding years, including the first election of Barack Obama, the Great Depression, the Civil Rights Movement, WWII, the War in Iraq, the American Civil War, the American Revolutionary War, Asian tribes crossing the Bering Strait, Christopher Columbus discovering the Americas, the Mayflower landing, the Boston Tea Party, the 13th Amendment, and the declaration of Independence.