Answer:
Richard M. Nixon
Explanation
The 36 vice president of the United States was Richard M. Nixon
The causes of great migration because some native Amercians were Hunter gathers so they could hunt and get their food ans some other Native americans used agricultural, but there was 1 problem in the winter they colden't plant or find food so they had to migrate. Did that help?
Growing their own food, producing more milk for butter and yogurt. I think maybe... more room for whatever kids there were to run around.
I think.