I think it's the telephone because it allows people to communicate better and customers or workers don't have to walk up to everyone and disturb them. You may elaborate more on this with your own opinion
The Black Death killed millions of millions of people which lowered the population
Answer:
High tariffs caused other nations to place taxes on US farm products which lost them sales and caused the prices to go down but industry benefited because of the low prices and the high tariff, therefore the Wall Street benefited again.
Explanation:
