The document adopted in 1776 declaring the colonies' independence from Britain
The Declaration of Independence
The war fought between the Northern and Southern states from 1861 to 1865
The Civil War
The long period of tension between the United States and the Soviet Union after WWII
The Cold War
The first governing plan of the United States that created a weak national government
The Articles of Confederation
The period of rebuilding the South after the Civil War
Reconstruction
The movement led by figures like Martin Luther King Jr. seeking equal rights for African Americans
Civil Rights Movement
The belief that Americans were destined to expand westward through North America
Manifest Destiny
The severe economic crisis that began in 1929
The Great Depression
The terrorist attacks on the United States on September 11th, 2001
9/11