What was Blanche K. Bruce the first African American to do? A. Go to Canada as a government representative
B. Serve on the Supreme Court
C. Be elected to a full term in the U.S. Senate
D. Win election to a political office

In the 19th century, the United States was marked by an industrial transformation through the development of the industrial economy.

Explanation:

The industrial transformation that the United States had in the 19th century was especially reflected by the rapid expansion of big business, the development of large-scale agriculture as well as the increment of national labor unions and industrial conflict.  

The farming took a very important role at that time principally in the field of big business because of the mechanization. This made the United States the world's premier food produce, a position it has never delivered.