How do political systems rise, develop and decline ?

I'll answer this as best as I could. I really hope this helps.

Explanation:

Political systems are formed when a group of people in a civilization begins to form social classes, with the elite at the top and making decisions and laws. They continue to rise when the political system of one civilization begins to branch out to other civilizations, but they also decline when that political system is overthrown by another, or if they experience a mass decline in public opinion.

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.