| A | B |
|---|
| Missouri Compromise | Act that equalized number of free and slave states |
| Civil War | The war between the North and the South, begun over the issue of slavery |
| Pony Express | Mail delivery system to the West |
| Homestead Act | Act that gave citizens free land in exchange for cultivation of the land |
| Ellis Island | Entry point for European immigrants during the late nineteenth and early twentieth century |
| US - Mexican War | Texas, California and the Southwest annexed. |
| Monroe Doctrine | American contienents were no longer open for colonization by European powers. |
| Gold Rush | Discovery of gold in the West led to migration westward |
| Underground Railroad | Route followed by slaves in their quest for freedom in the North |
| Louisiana Purchase | US purchase from France large tract of Southern land |
| The Alamo | Mission in San Antonio, where Texans faced the Mexican enemy in their quest for freedom for Texas. |
| Oregon Trail | Route that settlers followed from Missouri to Oregon to settle in the West |
| Lewis and Clark Expedition | The first official exploration of unknown lands beyond the Mississippi River. |
| Transcontinental Railroad | Completion of the railroad from the East to West coast |
| Erie Canal | Man-made waterway built to connect the great lakes with the New York harbor |
