Context: In the 1980s and early 1990s, there was a significant movement in favor of the territory becoming a commonwealth, which would give it a level of self-government similar to Puerto Rico and the Northern Mariana Islands. However, the federal government rejected the version of a commonwealth that the government of Guam proposed, due to it having clauses incompatible with the Territorial Clause (Art. IV, Sec. 3, cl. 2) of the U.S. Constitution. Other movements advocate U.S. statehood for Guam, union with the state of Hawaii, union with the Northern Mariana Islands as a single territory, or independence.

Question: What major movement occurred in Guam in the 80's and 90's?
Answer: becoming a commonwealth

Question: Why would Guam becoming a commonwealth be so important?
Answer: would give it a level of self-government similar to Puerto Rico

Question: What is the name of this U.S state that could possibly form a union with Guam?
Answer: Hawaii

Question: In what decade was union between Hawaii and Guam first brought up?
Answer: Unanswerable

Question: In what decade did union between Guam and the Northern Mariana Islands first start to get talked about?
Answer: Unanswerable

Question: In what decade was the U.S. Constitution last modified?
Answer: Unanswerable

Question: When did people in Guam start advocating for U.S. statehood?
Answer: Unanswerable