1900s is a time to get my hair finished today and
I read a book series on this subject and I'm pretty sure its D. All of the above. Because many African Americans were indeed looking for job opportunities instead of being slaves and working on plantations, would face rarely any harsh racism there, and well the government didn't exactly help but there was many operations aiding the move.
The significance of the Columbus voyages is that the explorer Christopher Columbus made four trips across the Atlantic Ocean from Spain: in 1492, 1493, 1498 and 1502. He was determined to find a direct water route west from Europe to Asia, but he never did. Instead, he accidentally stumbled upon the Americas.
Hope this helps! Sending light and love your way