The articles of union
a. gave oliver cromwell the role of lord protector
c. established one government for england and scotland
b. offered the monarchy to william of orange
d. removed the right of habeas corpus

The Articles of Union "c. established one government for England and Scotland," since it was seen as both socially and economically advantageous to unite the two lands. 

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.