I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "In 1986, the Compact of Free Association with the United States entered into force, granting the Republic of the Marshall Islands (RMI) its sovereignty. The Compact provided for aid and U.S. defense of the islands in exchange for continued U.S. military use of the missile testing range at Kwajalein Atoll. The independence procedure was formally completed under international law in 1990, when the UN officially ended the Trusteeship status pursuant to Security Council Resolution 683."? 

How did the Marhsall islands gain independence?