In the late 1800's the United States began to acquire overseas territories and to increase trade with Asian countries. Victory in the Spanish-American War gave the United States more territories and further influence in Cuba. The United States also became increasingly involved in the internal affairs of Latin America. Following a long period of increasing tensions, World War 1 began in Europe in 1914. The United States initially chose to remain neutral in the conflict, but the deaths of Americans in German U-boat attacks and the publication of the Zimmerman Note led the United States to declare war in 1917. After the Allied victory, Germany was forced to give up part of its territory and pay large war reparations, although President Wilson argued for less harsh peace terms.

By the end of this period of exploration in history, you will be able to do the following:
- Analyze the effect of the Spanish-American War on Cuba, Puerto Rico, and the Philippines.
- Analyze the major causes for World War 1.
- Identify events that led most of Europe to become involved in the war.
- Describe trench warfare.
- Describe the effects of the war on industry and labor in the U.S.
- Describe Americans' reaction to the Treaty of Versailles.
- Analyze changes arising from the transition to a peacetime economy.
- Discuss the effects of religion on American society during the 1920's.