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Guam was ceded to the US by Spain. The rest of the islands were sold to Germany.
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US constitution did not apply to Japanese occupation.
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In World War 1 Woodrow Wilson claimed proclamation of neutrality for Guam
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Guam was captured by the Japanese.
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United States took back Guam from the Japanese.
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Guam was established as a unicorperated territory of the US.
Guam citizens were granted US citizenship. This happened very close to the end of the Spanish American War. -
Ports of Guam were open to civilian traffic.