He ruled most of Western Europe from 768-814. And in 800 he was crowned emperor of the romans
The major way in which border areas of the west were affected by the mixture of people is that a plethora of immigrants from all over the world wanted to expand to the west in order to settle--meaning that people from all backgrounds often fought over land and job opportunities.
The different branches of the government help limit the power of the federal government because there are checks and balances with each branch and if one branch doesn't quite agree with the executive branch then the two other branches can overrule the president's power.
