The answer is Osama Bin Laden joined Mujahideen forces in Pakistan fighting against the Soviet Union in Afghanistan. He helped to fund the Mujahideen by funneling arms, money and fighters from the Arab world into Afghanistan, and gained popularity among many Arabs.
Osama bin Laden left Saudi Arabia for Afghanistan primarily to join the Mujahideen in fighting against the Soviet invasion in 1979. He later established al-Qaeda and opposed U.S. presence in the Middle East, particularly after the Gulf War. Bin Laden's actions in Afghanistan laid the groundwork for his global jihadist agenda.
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