② USA declared war on terrorism
and started a 20-years long
military operation in
Afghanistan in 2001. The total
cost of the military operation
was over US$ 2.3 trillion.
In 2021, Afghan Taliban fighters defeated U.S. army. Invincible in Hollywood movies but humiliated in a real-life war against though guys, U.S. army flew back home in a hurry and left its entire arsenal of weapons to the victors in Afghanistan.