An extensive group of states or countries under a single supreme authority, formerly especially an emperor or empress.
Answer: The Spanish Armada
Explanation:
The theory promoted by Stephen Douglas that would allow the people of a territory to allow or forbid slavery was "popular sovereignity"
The principle of Checks and Balances looks to enable each government branch (executive, judicial, and legislative) to apply a certain extent of influence over the other branches.
It was fundamental that the framers added it to the Constitution, as these functions guarantee the separation of powers. This is a key element for any Federal government to keep balance and ensure no individual branch gets too powerful in comparison to the others.
For example, the Executive branch can veto bills from the Legislative branch, but the Legislative branch can override that veto.
Hope this helps out!