united_states | ethnicgroup | african_americans <tsp> united_states | language | english_language <tsp> united_states | leadertitle | president_of_the_united_states <tsp> 250_delaware_avenue | location | united_states <tsp> united_states | leadername | barack_obama <sep> the united states of america (usa or usa), commonly known as the united states (us or us) or america, is a country primarily located in north america it consists of 50 states, a federal district, five major unincorporated territories, nine minor outlying islands, and 326 indian reservations the united states is the world's third-largest country by both land and total area 
250 delaware avenue is located in the united states. a country where the leader is known as president of the united states. barack obama is the president in this english speaking country where one of the ethnic groups is african americans.the united states is the world's third-largest country by both land and total area