In the 1840s, the American Party, known popularly as the "Know Nothing Party", was against immigration on the grounds that foreigners would take American jobs. This party wanted to strictly limit, if not eliminate, immigration to the US and were known for their violent opposition to it. By 1860, this party was essentially extinct, though nativist sentiment can still be found in pockets of American society.
There were possibly changes in ways that people travel, so people decided to take advantage of this to migrate for trade, or possibly more than that.
Computers and technology has made life way much easier since world war 2.
The country's staple in the South before the Great Migration was corn. The correct answer is B, corn.
