By 1821, what three countries shared territory in what is today the western United States of America? Those territories are American Samoa, Guam, Northern Mariana Islands, Puerto Rico, and the United States Virgin Islands.

Following the war, many islands were entrusted to the U.S. by the United Nations, and while the Northern Mariana Islands remain a U.S. territory, the Marshall Islands, Federated States of Micronesia, and Palau emerged from the trust territory as independent nations.

Explanation:

:p hope this helps

i believe that the answer to the question provided above is that  establishing smaller ethnic communities within larger communities  gives more chance for people to know each other more but this might lead to the  conflict between groups.

i think it is d korean