The Zimmerman Telegram started World War 1. The telegram was sent by Germany to Mexico trying to get them to join in an alliance.
Answer this question… World War II produced more dramatic historical changes.
The war was a stalemate before the United States became involved. After the United States became involved, the balance tipped to the Allied powers.
Answer this question…
Political pressure from Great Britain and France
European countries entered into military alliances that required them to protect one another from attacks
annexation of countries with large populations of Serbs