Nations united against Central Powers in WWI. Led by the United States.

Communist Revolution in 1917 that changed Russia to U.S.S.R.. Caused Russia to withdraw from WWI.

Prohibited the sale and use of alcoholic beverages. Repealed by the 21st Amendment. Remember by thinking you can't drink when you turn 18 but you can drink legally at age 21.

Passed in 1917 during WWI to keep people from speaking out against the U.S. government or military. Some believed it violated the first amendment. Eugene Debs, a socialist, was arrested for violating this law.

Socialist labor leader during WWI arrested and sentenced to 10 years in prison for violating this law by sending out flyers telling those with draft cards to burn them and not report for war.

President Woodrow Wilson's plan as part of the Treaty of Versailles, to prevent future world wars. One of the points was the League of Nations. U.S. Senators did not approve the Treaty because they did not want to join the League of Nations. The U.S. wanted isolationism.

During WWI them movement of African Americans to north to take jobs left vacant by U.S. soldiers

Policy of nonparticipation in international affairs. The main reason U.S. Senators didn't approve the Treaty of Versailles (League of Nations) after WWI.

International peacekeeping organization created by President Woodrow Wilson in the Fourteen Points of the Treaty of Versailles. U.S. did not join.

Sinking of this ship brought the U.S. into WWI. It is an example of Germany's use of Unrestricted Submarine Warfare.

Constitutional amendment that granted suffrage to women.

Movement in early 1900s which resorted to violent crime related to the sale of alcohol during prohibition.

Outlawing of the sale, production, or transportation of alcoholic beverages. The 18th Amendment ushered in the Era which ended when the 21st Amendment repealed the 18th.

Economic theory that resulted in the Government controlling the means of production and sell of goods and services. The state owns everything.

Treaty that ended WWI. The United States did not ratify the treaty because many senators and U.S. citizens protested involvement in the League of Nations, one of Wilson's fourteen points. U.S. Senators and citizens wanted to be isolated from world affairs.

Policy of the German to destroy any ship found in the Atlantic Ocean near Great Britain without warning during WWI. The Germans used torpedoes fired from submarines. The most popular was the HMS Lusitania. The use of this warfare caused the U.S. to enter the war (WWI) in 1917.

28th President of the United States; led the US in WWI and secured the formation of the League of Nations even though the US Senate did not approve it, and prevented the United States from joining.

War from 1914 to 1918 between the Allied powers (Great Britain, France & US) against the Central Powers (Germany, Austria-Hungary, and the Ottoman Empire [Turkey]). The US entered in 1917 because of Germany's use of Unrestricted Submarine Warfare.

Germany sent this to Mexico instructing an ambassador to convince Mexico to join Germany in war against the US if US declared war on Germany. Germany promised Mexico part of the United states that it had lost in the Mexican-American War.