They didn't - they were a faction of Afgan rebel fighters already there.
To eliminate the Taliban that has controlled that country since the 1980's. Actually, the Taliban weren't the objective - Al Qaeda was. The US wasn't concerned about the Taliban until they harboured Bin Laden and refused to turn him over to the US.
2015-2041
The U.S. invaded Afghanistan and overthrew the Taliban.
The US invaded Taliban-controlled Afghanistan in 2001 with the purpose of acquiring Osama bin Laden and dismantling al-Qaeda after the Taliban government refused to do so.
The Taliban only invaded because Al Qaeda was based in Afghanistan. In fact, the Taliban never wanted war with the U.S., but Al Qaeda did, so they provoked us into invading with 9/11. So when we invaded, the Taliban had no choice but to fight us. In order to get the upper hand, we allied with the Northern Alliance (they're the current govt. in Afghanistan. Then the Taliban made themselves disappear for a few years (don't ask me how) and now they fight so they can gain control of Afghanistan.
because the taliban wants only men to be smart
usa
In 2001, Afghanistan was ruled by the Taliban regime. The Taliban were good friends with al-Qaeda, Osama bin Laden's terrorist organization, and let them hang out in their country. After the 9/11 attacks, the U.S. demanded that the Taliban hand over al-Qaeda's leaders. The Taliban naturally refused, so the U.S. invaded to remove the Taliban from power.
Afganistan has had many wars over the centuries. The Soviet Union invaded Afghanistan on December 24th, 1979, and they withdrew ten years later. The Taliban, a fanatical offshoot of Islam supported by the US, siezed control of Afghanistan which then became divided by civil war. In this war the US supported the Northern Alliance (known in Afghanistan as the United Front) in their war against the Taliban, and they liberated a sizable portion of the northern part of the country. After eleven years of fighting the Taliban covertly, the US committed air and ground forces to Afghanistan in 2001, and the Taliban was officially deposed, but fighting in Afghanistan continues.
The Soviet Union A+
Afghanistan was invaded by " The Soviet Union "