1. California, North Carolina, Kansas, New Hampshire, West Virginia
Aired: Apr 21, 2007The San Francisco earthquake of 1906 and subsequent major tremors along the S...
Crossing the icy Delaware River on Christmas night, 1776, allowed George Washington to surprise the British at Trenton, a critical American victory in the Revolutionary War. One of the world's most recognizable natural landmarks, the Grand Canyon, defies the imaginations of the five million people who visit there annually. Pioneer Daniel Boone blazed the Wilderness Trail through Kentucky in 1775 and tamed the wild frontier. The opening of "The Unassigned Lands" in Oklahoma resu...