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During the Persian Gulf War in 1990, Saudi Arabia allowed U.S. troops to be stationed there. Osama was highly insulted that the Saudi government would let non-believers into the birthplace of Islam. He blamed the United States presence in Saudi Arabia for the economic crisis that was happening there. Because of Osama's anti-government activities Saudi Arabia expelled him from their country in 1991. Osama then traveled to Sudan where he spent several years. While in Sudan he claimed that he was the one responsible for the attack on a hotel in Aden, Yemen in 1992 where about one hundred U.S. soldiers were staying before heading to Somalia for Operation Restore Hope. There were no reported injuries from the attack. Osama also took responsibility for killing U.S. soldiers in Somalia and on the World Trade Center attacks that took place in 1993 killing six and injuring more than a thousand people.
After taking responsibility for these several attacks he was expelled from Sudan after pressure from the United States and Saudi Arabia governments. Upon being expelled he then traveled back to Afghanistan where the Taliban has provided him a safe haven since 1996. This is when Osama issued a Declaration of War (jihad) against the United States. At this time he was also accused of killing nineteen U.S. soldiers in Saudi Arabia.
In 1998 Osama called for Americans and Jews, even children to be killed. His decree that he issued charged Americans of declaring war against Muslims. In which he stated " for seven years the United States is occupying the lands of Islam in the holiest of its territories, Arabia, plundering its riches, overwhelming its rulers, humiliating its people, threatening its neighbors, and using its bases in the peninsula as a spearhead to fight against neighboring Islamic people." Osama bin Laden's goal is to expel the enemy (the U.S.) from the Holy Land of Islam, to help Iraq defeat their enemies, and to help Palestine gain control of the al-Aqsa mosque in Jerusalem from Israel.