What city became the car manufacturing capital of the world in 1920

Which statement best explains how the invention of corporations contributed to the economy in the 1800's

What former head of the cuban secret service was charged with protecting the country's prime minister for nearly 50 years?

How did african americans the union during the civil war? a. by serving as representatives in congress b. by enlisting in the military to fight c. by organizing massive slave revolts in the south d. by negotiating for peace with the confederacy