[176] After a U.S. serviceman was shot by Panamanian forces in December 1989, Bush ordered the United States invasion of Panama, known as "Operation Just Cause". The invasion was the first large-scale American military operation in more than 40 years that was not related to the Cold War. American forces quickly took control of the Panama Canal Zone and Panama City. Noriega surrendered on January 3, 1990, and was quickly transported to a prison in the United States. Twenty-three Americans died in the operation, while another 394 were wounded. Noriega was convicted and imprisoned on racketeering and drug trafficking charges in April 1992.[175] Historian Stewart Brewer argues that the invasion "represented a new era in American foreign policy" because Bush did not justify the invasion under the Monroe Doctrine or the threat of Communism, but rather on the grounds that it was in the best interests of the United States.[177]

Gulf War
Main article: Gulf War
Iraq (green) invaded Kuwait (orange) in 1990
Faced with massive debts and low oil prices in the aftermath of the Iran–Iraq War, Iraqi leader Saddam Hussein decided to conquer the country of Kuwait, a small, oil-rich country situated on Iraq's southern border.