What was the main reason the pilgrims emigrated from england and came to america

Need on these last 2 questions on my social studies homework 5 and 6 then i’m done with the homework

What does it mean to say the united states has a federal system of government

Why did the louisiana purchase encourage the relocation of native americans? a: additional land was available for resettlement. b: many native americans wanted to move west. c: trading opportunities in the territory promoted settlement. d: western tribes requested that others join them.