The United States lies between two oceans,______to its east and______to its west.A．the Pac

The Federal Government s the central government of the United States. It is divided into t

Most of the first Chinese immigrants who came to the United States between 1850－1880 settl

The United States went war with______in 1812, the last war fought between the two countrie

The Civil War began in______between what the United States of America called the Union and

______forms a natural boundary between Mexico and the United States.A．The Rio Grande River

Here in the United States, before agricultural activities destroyed the natural balance, t