The event which started the Gulf War in 1991 was a) the invasion of Kuwait by Iraq. There were the largest amount of coalition forces during this war since World War II, with most of them being from the United States, the United Kingdom, Saudi Arabia and Egypt fighting for Iraq to immediately stop it's invasion and annexation of Kuwait.
Explanation:
the conflict began after Athens and Eritrea gave assistance to tue lonians in their rebellion against Persia and it ruler, Daruis. Although Darius was able to secure the loyalty of many Greek city-states, both Sparta and Athens executed his ambassadors rather than give up independence.
Missouri Compromise is your answer.