The US entered WWI due to events like submarine warfare and the Zimmerman Telegram, while WWII was initiated by the Japanese attack on Pearl Harbor. Both wars unified the US against common enemies and spurred growth in various aspects of American life.
The United States entered World War I due to submarine warfare and the Zimmerman Telegram, leading to Congress declaring war on Germany in 1917. The nation's lack of preparedness for modern war required time to build up its army and navy for the conflict.
For World War II, the catalyst for America's entry was the Japanese attack on Pearl Harbor in 1941. This event marked a turning point that brought the United States into the global conflict.
Both World War I and World War II played significant roles in shaping American life and culture by unifying the nation against common enemies and facilitating unprecedented growth through various developments in immigration, industrialization, and technology.
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