This happened in the War of 1812
Northerners claimed the law was unfair. The flagrant violation of the Fugitive Slave Law set the scene for the tempest that emerged later in the decade. But for now, Americans hoped against hope that the fragile peace would prevail.
Answer:
They established a clear portrayal of political power. They allowed a firm foundation of governing principles. They allowed all people an equal voice in government.
In the Spirit of the Laws (1748), Montesquieu argues that any government, if it is to protect the liberty of it's citizens, needs a separation of powers.
Answer:
You could talk about the first amendment, and how it says that congress can't pass laws that "abridge" your freedom of speech. People should be able to say whatever they want, so the public should be held responsible for what people can or cannot say, not the government.