America has a long history of protests - some have inspired great change while others resulted in brutal confrontations. These are four of the most important protests in American history. 

As a feat of modern technology and ambition, the Erie Canal changed commerce between the United States and the rest of the world. This is how it happened. 

The Cold War was a tense time for many American citizens – as friction between America and the Soviet Union reached a fever pitch, many came to suspect even their closest neighbors as Russian communists or spies. In the midst of this hostility, the arrest and trial of husband and wife Julius and Ethel Rosenberg seemed confirm many Americans worst fears. Read on to learn more about the Rosenbergs, and the trial that rocked 1950s America.