Answer:
The three different branches of government include Legislative, Judiciary, and Executive. The different branches work with checks and balances to keep each other "in check." THinking about it, is that where the phrase, "in check" comes from?
Why each are important:
The Legislative makes the laws. (Congress, Senate, and House of Representatives)
The Executive enforces the laws.
THe Judiciary interprets the laws.
<span>The College of William and Mary. Established: 1693</span>
The idea of it was that the United States was created by God to span across America "From Sea to Shinning Sea". This belief did lead into the Mexican-American War where the U.S. got it's wish of Manifest Destiny