I want to know the answer to the following question:
What established Guam as an unincorporated territory?
All the background I'm provided with is that "The Governor of Guam was federally appointed until 1968, when the Guam Elective Governor Act provided for the office's popular election.:242 Since Guam is not a U.S. state, U.S. citizens residing on Guam are not allowed to vote for president and their congressional representative is a non-voting member.". Is that enough to answer the question?