Final answer:
The United Nations (UN) worked with the United States in the Persian Gulf War, forming an international military coalition to enforce resolutions demanding Iraq's withdrawal from Kuwait.
Step-by-step explanation:
The international organization that worked with the United States in the Persian Gulf War was the United Nations (UN).
The UN passed several resolutions demanding that Saddam Hussein withdraw from Kuwait, and President George H. W. Bush organized an international military coalition to enforce these resolutions. The US mission was called Operation Desert Storm, and it involved the participation of thirty-four countries, including many members of NATO and Middle Eastern countries such as Saudi Arabia, Syria, and Egypt.
This coalition conducted a successful air campaign followed by a ground invasion that liberated Kuwait and led to a ceasefire.