00:00Why did the United States enter World War I?
00:02Many people point to the sinking of the Lusitania, but that wasn't the real turning point.
00:06The real trigger was the Zimmerman telegram.
00:08In this secret message, Germany asked Mexico to attack the United States.
00:12In return, Mexico was promised Texas, New Mexico, and Arizona.
00:16At the same time, Germany restarted unrestricted submarine warfare hitting American ships.
00:21Once the Zimmerman telegram was exposed, in 1917, the United States declared war.
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