What concepts are described in the following sentence?

"The United States is the country of the Bacon Explosion. Barack Obama was once the leader there, the capital is Washington D.C. and Native Americans are one of the ethnic groups of the country."

Return the answer as pairs of triples.
Bacon Explosion COUNTRY United States
United States LEADER_NAME Barack Obama
United States ETHNIC_GROUP Native Americans in the United States
United States CAPITAL Washington, D.C.