Nobles had overthrown most of the monarchs by

You have to specify in what country? If the answer is France, they were mad at Louis XIV because he gave them no taxation yet no representation in government. This was very common in an absolutist government like France at the time. The nobles wanted the say in government so they teamed up with the peasants (had taxation and no representation) who were also very mad and they went to war with the monarchy. The monarchy lost because of the amount of people the nobles and peasants had. 

Contributing factors  leading  to the harlem renaissance were the great migration of african americans to northern cities, which concentratedambitious  people in places where they could encourage each  other, and the first world war, which had created new industrial work opportunities for tens of thousands of people.