The U.S. Constitution achieved limited government through seperation of power.
Explanation:
The U.S. Constitution horzontially separated power across three branches. The branches of government are legislative, executive, and judicary. Each branch provides a check on power on the other branches.
The evidence that proves that the Indus civilization included a well organized government was their cities were laid out in an organized pattern, and they had a complex plumbing system. They also had a system of weights and measures.