I'm going to go with John Locke, not to sure though you should double check to make sure because I might be wrong.
All of those are a part of Great Britain
there you go thats the answer and the work
C, A, B, C, C
Source: Took APUSH (AP U.S. History) 2 years ago.
The last straw that ended the Roman Empire for good were Barbarian groups attacking them and their land.