In answer to Troll's question

The USA has had a policy of returning captured territory that goes back to the 19th Century.

We "captured" and returned to self government both Cuba and the Phillipines after the Spanish American War, and after some period of US governorship.

During WWI all of our fighting was done in France, so the matter is moot for this war.

In WWII we captured many of the Pacific Islands including Guam, Okinawa, and Japan, and all but Guam have reverted back to their original, but no longer war-like, governments/self rule. Guam remains a US protectorate, but could become its own country if they chose.