Why did the middle colonies have such a diverse european population?

a. the middle colonies had the richest silver mines, which attracted people from all over europe.
b. the king set limits on how many people from each country could settle in the middle colonies.
c. the middle colonies had a policy of religious toleration.
d. the middle colonies were the closest to europe of the american colonies.

Why were presidents andrew jackson and martin van buren unwilling to annex texas? a. they did not want texas to be admitted to the union as a slave state. b. they feared that the annexation of texas as a slave state would lead to political problems within the union. c. they thought that texas was too large to be admitted to the union as one state. d. they did not believe in the idea of manifest destiny.