The US Constitution divided power in three independent branches: the Legislative Branch, the Executive Branch, and the Judicial Branch. This separation applies to the federal government and also to the government of each of the States.
The main aim was to keep power balanced. The Constitution also established the 'Checks and Balances' system, through which each of the powers can check on the others and prevent that they exceed their functions. None of the three powers could gather such a large amount of power to rule over the others, without being punished.
The Crusades have had negative and positive consequences. The negative ones were the destruction of properties, the massacres that took place during the war, the exploitation of populations.
The positive consequence was that it was possible the contact between two civilizations that have influenced each other.
Protect interests of bystanders.
I believe it was a telescope
Legislative branch has senate and House of Representatives