united_states | ethnicgroup | african_americans <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. the leader of which was president barack obama. a member of the african american ethnic group.the united states is the world's third-largest country by both land and total area