The "rules committee" in the House can limit the amount of time to debate a bill.
The firsts codes of law came from the ancient cities, you know like rome and greece, and jerusalm. They had laws like we do now, for example, if you steal thats against the law, what is the punishment? its stated in the law you will go to jail or do community service. Modern days it pretty much the same thing, we took those building blocks that the early humans have made and just built on top of it making it better. (if you need more info just comment)
I think, that the answer to why, is that the change in presidencies from republican to democratic (i might be wrong, and it could be democratic to republican) influenced the change slightly because the new party, wanted to focus on different issues such as westward expansion. As to how, it was because the government withdrew all federal troops from the south, so there wasn't anybody to enforce the laws protecting African American rights so the southerners were free to exploit the African Americans to their will.
Answer:
powers are shared across 3 branches and citizens can file grievances
I think is should be all. Idk about moose cause Deer and Bears are woodland.