1) In 1492.
2) the native Americans - American Indians.
3) The USA is situated in the Northern hemisphere, In North America continent and it borders on Mexico in the south, Canada in the north and Russia in the West.
4) Washighton, DС
5) There are 50 states
6) the weather is different in different parts of the country; in the south it is hot and humid, in the east, cool and windy and in the west it is hot and dry, in the north cool with high rainfalls.
7) New York is the biggest city in the country.
8) Alaska is the largest state.
9) Because some parts of New York are situated on some islands of the Hudson river.
10) The Statue of Liberty, Bald Eagle, American flag.