Competition for land in North America led to the French and Indian War because mainly of the Ohio Territory. The British and the French pushed wanted to extend their colonies into the land west of the Appalachian Mountains. Many Natives had to leave their homes and many were slaughtered and killed by the French if they did not leave the land. This caused an outrage as the Natives did not want to leave which caused the war to begin.
The point of checks and balances was to make sure no one branch would be able to control too much power, and it created a separation of powers. Here are some examples of how the different branches work together:
The legislative branch makes laws, but the President in the executive branch can veto those laws with a Presidential Veto.
The legislative branch makes laws, but the judicial branch can declare those laws unconstitutional.
TRUE!
Since then no non-American Army has invaded any American county, although some conflicts still happened, such as the Falklands War of Argentina with UK.