Answer:
When Iraq failed to leave Kuwait by the U.N. deadline of January 15, 1991, the United States and its allies launched a U.N.-authorized military assault.
Explanation:
Iraq had invaded and annexed Kuwait months before that. When Iraq refused to leave Kuwait by the said deadline, the US launched the Operation Desert Shield to expel the occupying forces. This operation would turn into Operation Desert Storm, also known as the Gulf War.
