Whats a lasting impact that new imperialism had on africa? a. political instability
b. an established African manufacturing base
c. social Darwinism as a justification for racial equality
d. thriving resource-based economy
provide an explanation so I know how reliable the answer is

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.