What two events angered many americans and led to increased support for the u. s. to enter world war i?
a. the assassination of the austrian archduke and the russian revolution
b. the sinking of the lusitania and the zimmermann telegram
c. the bombing of pearl harbor and the german invasion of poland
d. the explosion of the maine and the stalemate in europe

B. the sinking of the Lusitania and the Zimmermann Telegram

Explanation:

When Germany attacked a British ship, the Lusitania, over 100 Americans were killed. This event greatly angered many Americans.

Later, in 1917, a message from Germany to Mexico was found. It asked Mexico to declare war on the U.S. This message, called the Zimmermann Telegram, was published in the U.S. and turned many Americans against Germany. The U.S. declared war on Germany on April 6, 1917.

definitely a for sure. ill see and update if i get the answer