Why was the Zimmermann telegraph important to World War I?a. It caused Mexico to join the war. b.It caused the United States to join the war. c.It made Russia join sides with the Central Powers. d.It made Great Britain join the war.

B

Explanation:

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.

the answer is: c. c.it limited the president’s power to start wars.

the war powers resolution of 1973 requires the president to notify the congress whenever the president wanted to order a military operation to other countries within 48 hours. if after being reviewed the congress disagree with the proposal, that the president will be banned from ordering the operation.