"The Sod Wall Is About 2 Feet Thick at the Ground,and

"The sod wall is about 2 feet thick at the ground,and slopes off on the outside to about 14 inches at the top.The roof is composed of a ridge pole and rafters of rough split logs… Occasionally a newcomer has a "bee," and the neighbors for miles around gather at his claim and put up his house in a day… tried a new dodge with the cornmeal.Mixed it with a little water and salt…My supper will be a slice of ham boiled with beans,and a slice of bread.How is that for high toned?..."
Howard Ruede,1877
-Which of the following earlier historical events was most similar to the post-Civil War westward migration?

A) The Great Migration
B) Northwest Ordinances of 1785 and 1787
C) The California gold rush
D) The purchase of the Louisiana Territory