Saddam Hussien had been at war with Iran for 8 years. In this time he had used all of his countries' money and resources to fund the war. He saw opportunity in Kuwait because of their vast oilfields and decided to have them for himself. As he massed troops on the border, president Bush saw the need to protect the oil fields, and thus world stability and warned Hussien not to do it. He kept on, and Bush responded by sending in the troops.