What is the government where people rule?

The division of power between the three branches

The following are examples of which principle: president vetoes a bill, the U.S. Supreme Court can declare a law unconstitutional and Congress can override a veto.

I have freedom of speech, religion, and press.

The president has to follow the law.

I get to vote for my representatives.

"We the people"

The federal government has the power to make treaties, the state governments have the power to regulate state commerce or trade, and both of them can levy taxes.