Answer:
2001
Step-by-step explanation:
The American invasion of Afghanistan occurred in 2001, the same year that the United States was attacked by Osama Bin Laden's Al Queda terrorist network on the tragic September 11.
Afghanistan was accused by the US government of supporting and hiding bin Laden, and became the number one target of US troops. Thus begins the so-called War on Terror, established by President George Bush. Congress enacted various laws to protect the country and endorsed the President's decision to invade Afghanistan as a reprisal for the attack on US territory.