Help me please? tysvm! Need a detailed answer.

What is the name for the main idea behind the settling of western lands by americans in the early-1800s?

Who founded the social contract theory of the government

How did the war of 1812 contribute to an increase in u.s. manufacturing? a) the war provided more resources for factories to increase production. b) the war promoted trade between countries so that americans could focus on fighting. c) the war cut americans off from their previous supply of imported manufactured goods. d) the war limited transportation in america, making it necessary to import manufactured goods.