How was the United States involved in Operation Desert Storm in the Persian Gulf War

Iraqi president Saddam Hussein ordered the invasion and occupation of neighboring Kuwait in early August 1990. Alarmed by these actions, fellow Arab powers such as Saudi Arabia and Egypt called on the United States and other Western nations to intervene. Hussein defied United Nations Security Council demands to withdraw from Kuwait by mid-January 1991, and the Persian Gulf War began with a massive U.S.-led air offensive known as Operation Desert Storm.

- From history.com

no every country is held to the same degree as others just some member countries such as the usa and germany are more economically sound so the need to show there support to all others