Germanic tribes invaded and overpowered the Romans.
D-- each vote is counted once, booths are always set up for the privacy of voters, and if the election is truly fair and free people are swayed by their own opinions and not the opinions of others.
I believe the answer to be Charudatta, though you may want to double-check.
Separatists (which could also be known as Puritans depending on what your answer choices/teacher preference is)