States must honor laws and judicial proceedings of other states:

Which type of search will return the best results? 

Population of the United States in 1790 was 76 million.

Murder is the only criminal law mentioned in the US Constitution.

There were a total of 156 million cellular telephone users in 2009.

A layer cake is used to describe the distinct characteristics of creative federalism.

A way of dividing power among the three branches of government in which members of the House of Representatives, members of the Senate, the president, and the federal courts are selected by and responsible to different constituencies:

Apportionment is the process done every ten years, following the US Census count, to determine how many members to the House of Representatives each state will get.

Number of U.S. Senators for each of the fifty states:

Average life expectancy of the American people in 1904 was 64.