Explications:

2.The president lives at Washington. It is Washington because this city was created in the past to be a city where the seats of national institutions (government, parliament ...) would be established. Hence the current common name, Washington, D.C., which means "Washington, in the District of Columbia".

3.The name of the building were the presidente lives is call '' White house ''.

4.They are 50 stars in the American flag.

5. The 50 stars collectively represent the Member States of the Union.

6. They are 13 stipes in the  American flag.

7. The thirteen bands collectively represent the 13 secessionist British colonies that created the American state.

8. The declaration of independence was draft in one thousand seven hundred seventy six (1776).

9. The constitution adopted in one thousand seven hundred eighty one (1781).