Why did industrialization create a need for skyscrapers?

Which statement best describes a major advantage of a confederal system of government over a unitary system

What are new social classes emerged due to advancement in agriculture ?

Which of the following statements about slavery is not accurate? a. slavery in the americas was no different than slavery in ancient greece or rome. b. beginning in the 1600s, slaves began to be viewed as property, rather than people. c. slavery did not originate in the americas. d. slavery was very important to the economy of the american colonies.