Answer:
US and coalition troops tried to stop Iraq's invasion of Kuwait because the world depended on Kuwait for oil.
Step-by-step explanation:
On August 2, 1990, the Iraqi president Saddam Hussein invaded the neighboring state of Kuwait because of its sizable oil reserves. The reasons for the invasion must be traced on two levels: the first, consisting of a showdown with the United States and its allies, as a consequence of the ambiguous Middle Eastern policy pursued by the Washington government during and after the Iran-Iraq War; the second claiming Kuwait's membership in the Iraqi national community, on the basis of the common Ottoman past and a substantial ethnic identity, although Iraq recognized the independence of the small Emirate of the Persian Gulf when it was admitted to the Arab League.
The invasion resulted in immediate sanctions by the UN which launched an ultimatum, requiring the withdrawal of Iraqi troops. The request was unsuccessful and on January 17, 1991, U.S. troops, supported by coalition contingents, entered Iraq. The intervention of the anti-Iraqi coalition found its most concrete motivation in oil resources and in the blockade of Kuwaiti capital on the American, Asian and European financial markets, caused by the Iraqi invasion.