The Zimmerman Telegram suggested that Mexico ally itself with Germany against the United States. What did the telegram convince Congress to do?
The graph shows the results of German submarine warfare in early 1917.

Following the Great Depression, in which country did economic recovery occur most quickly?
Each country had its own goals in negotiating the Treaty of Versailles. What was the goal of the British prime minister, David Lloyd George?
Which event had the immediate effect of causing Germany to declare war on the Allies?
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