What features does the United States have that makes it such a good candidate
for self-government, according to Madison?

Explanation:

What is particularly needed, Madison believed, is that citizens possess a sound understanding of their rights and responsibilities.  The challenge for the citizens of a democracy is to moderate his desires and demands – to moderate the use of his liberty – so that he not only exercises his own rights, but demonstrates respect for the rights of others.  In other words, self-government obliges us to practice measured liberty. Hope that helps!!!

1. it was caused by feudalism

2. charlemagne used christianity as a major cornerstone for his rule. cloisters were built all over the empire to act as centers for the (re)population of the vast european wilderness.

3. the europeans feared the next raid every time chetak

i'm not so sure about #6. but i hope i you with the first 3.