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!!!