U.K. US; U.S. USA; U.S.A2. Whats its national flag? The Stars and Stripes, Old Glory, The Starry Banner3.How do you know the meaning of its national flag? The stripes symbolize the 13 colonies that originally constituted the United States of America. The stars represent the 50 states of the Union. White signifies Purity and Innocence; Red, Hardiness and Valor; and Blue, Vigilance, Perseverance and Justice. 4. Whats the nickname of American people? Uncle Sam5. Whats its national anthem(国歌)? The Star-Spangled Banner 星条旗永不落6. There are many things that symbolize American culture, could you say some of them? No less than 10 items Many things that symbolize American culture. The list runs as follows: 1) Statue of Liberty 2)White House 3) President Hill 4)Lincoln Memorial Hall 5)Empire State Building 6)Times Square 7)Broadway Theater DistrictWhere is the US? Could you tell me its boundary ? How large is it? Whats its rank respectively all over the world concerning to its area and population? How many states are there in the mainland of the United States? And which two states are geographically separated from the other?