The machine gun was decisive in securing victories for the Allies in WW1, if that's the time period this is focused on.
The Hudson River in New York and the Delaware River in Philadelphia both had ports so trader could sell their goods to England or other places.
Answer: D. A large percentage of Americans became factory workers in cities
Explanation: The industrial revolution caused rapid urbanization in America, with people moving from the countryside to the cities in droves. ... The industrial revolution also caused a rise in unskilled labor. Prior to the 19th century, most Americans who were not employed in agriculture performed a skilled trade.
