The Civil Rights Act (1866) was passed by Congress on 9th April 1866 over the veto of President Andrew Johnson.
Square Miles of United States. The square miles of United States is 3,794,101 sq mi. This is equivalent to 9,826,675 km2. In terms of size comparison, it is slightly larger than the Peopleâs Republic of China. The 2010 estimated population is 310,931,000.
Of this territory, 9,158,960 square kilometers (3,536,274 square miles) are land, while there are 470,131 square kilometers (181,517 square miles) of water. The United States is about one-half the size of Russia, and slightly larger than either Brazil or China.