USA HISTORY

Detailed explanation-1: -The U.S. Readies for War The sinking of Lusitania didn’t directly cause the United States to enter the war. It did, however, fuel virulent anti-German sentiment in Britain and the United States and hinder diplomatic relations between Germany and the United States.

Detailed explanation-2: -The telegram was considered perhaps Britain’s greatest intelligence coup of World War I and, coupled with American outrage over Germany’s resumption of unrestricted submarine warfare, was the tipping point persuading the U.S. to join the war.

Detailed explanation-3: -This telegram, written by German Foreign Secretary Arthur Zimmermann, is a coded message sent to Mexico, proposing a military alliance against the United States.

Detailed explanation-4: -On April 4, the Senate voted to declare war against Germany, and two days later the House of Representatives endorsed the declaration. With that, America entered World War I.