Create a set of triples that describes the content in the following sentence.

1634 The Ram Rebellion is a novel from the United States, where the population are called Americans and the leader is called a "president." The capital is Washington D.C. and African Americans are one ethnic group there.
United States LEADER_TITLE President of the United States
United States DEMONYM Americans
United States CAPITAL Washington, D.C.
1634: The Ram Rebellion COUNTRY United States
United States ETHNIC_GROUP African Americans