Why did the United States participate in the Persian gulf war

Thé Untied States and the UN Security Council demanded that Iraqi troops from Kuwait, but Hussein refused

In August 1990, Iraq invaded the country of Kuwait to its southeast in a bid to gain more control over the lucrative oil supply of the Middle East. In response, the United States and the UN Security Council demanded that Iraqi dictator Saddam Hussein withdraw Iraqi troops from Kuwait, but Hussein refused.

Explanation:

I Googled it.