The Taliban government in Afghanistan supported global terrorism. Specifically, the Taliban provided a safe haven for Al Qaeda and refused to turn over Osama bin Laden after the 9/11 attacks.
However, going back to the early 1980's, the US was involved with arming and financing the Mujaheddin, an Islamist guerrilla force that fought against the Soviet occupation of Afghanistan. The US involvement was based on the "enemy of my enemy" philosophy of the Cold War.
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The sinking of the Lusitania caused the US to get involved.
84,000 US Soldiers are currently at war in Afghanistan
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World War I happened at the same time worldwide. Afghanistan was not involved in that war, however.
Gulf of Tulkon incident.