(A Polls showed that upwards of 80% of the American public supported the troop deployment...
One of the main concerns of the west was the threat Iraq posed to Saudi Arabia. The conquest of Kuwait had brought the Iraqi army within easy striking distance of the Saudi oil fields. Iraqi control of these fields as well as Kuwait and Iraqi reserves would have given it control of the majority of the world's reserves. Iraq also had a number of grievances with Saudi Arabia. The Saudis had lent Iraq some 26 billion dollars to prosecute its invasion of Iran. The Saudis had backed Iraq as they feared the influence of Shia Iran's Islamic revolution on its own Shia minority (most of the Saudi oil fields are in territory populated by Shias). After winning the war Saddam felt he should not have to repay the loans due to the help he had given the Saudis by stopping Iran.
On 12 January 1991 the United States Congress authorized the use of military force to drive Iraq out of Kuwait. The votes were 52-47 in the US Senate and 250-183 in the US House of Representatives. These were the closest margins in authorizing force by the Congress since the War of 1812. Soon after, the other states in the coalition also followed suit.
The United States and the United Nations gave several public justifications for involvement in the conflict. The most prominent reason was the Iraqi violation of Kuwaiti territorial integrity. In addition, the United States moved to support its ally Saudi Arabia, whose importance in the region and as a key supplier of oil made it of considerable geopolitical importance. During a speech given on 11 September 1990, U.S. President George H.W. Bush summed up the reasons with the following remarks: "Within three days, 120,000 Iraqi troops with 850 tanks had poured into Kuwait and moved south to threaten Saudi Arabia. It was then that I decided to act to check that aggression."[27] The Pentagon claimed that satellite photos showing a buildup of Iraqi forces along the border were the source of this information, but this was later shown to be false. A reporter for the Saint Petersburg Times acquired commercial satellite images made at the time in question, which showed nothing but empty desert.