Arule in both the north and the south was that a man could avoid the draft by: a. hiring a substitute. b. freeing a slave. c. working in a mill. d. opening an arms factory

Hiring a substitute so A is the answer.

there are a number of different ideologies that come into conflict with regard to immigrants and immigration to the us.

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering