The correct answer is B.
The development of cheap iron in the US was the major factor that lead to the building of skyscrapers. Being able to produce iron cheaply can be contributed to Andrew Carnegie. This American business mogul perfected the Bessemer process in several factories across the eastern part of the US. From there, he was able to sell cheap iron to American businesses for the purpose of growing their empire.
Human sacrifice was the most common. They would sacrifice humans to Aztec God's. Several Aztec's would sacrifice prisoners from war.
I hope this helps!
~cupcake
Answer:
I'm not sure but I think its D
Answer: If we abolish The Electoral College the election would be decided by Florida, the East Coast and the West Coast. Liberals would win every time with the big cities.