Can you help me with these please and thank you

Which of the following encouraged westward expansion? a.the government decreased the price of federal land. b.each of these represents actions taken to encourage westward expansion. c.the government decreased the price of federal land d.the second national bank lowered the cost of borrowing money (reduced interest rates)

6. how are goods and services distributed in a free market system?

Over time, who did the nature of slavery change in america