No, it is false that during the Industrial Revolution, the population declined due to a decrease in life expectancy, since in fact in many parts of the west life expectancies increased, due to increased incomes from more job opportunities.
The theory in which humans migrated to North America is the land bridge also known as the Bering Strait.
Well, because most white men were away fighting, and jobs needed to be filled, black people and women found jobs. This was a great leap in the civil rights movement, because now white people were forced to accept black people. It was bad for Japanese americans because they were forced into a racism of their own. Americans assumed that all Japanese were bad, and took them of their jobs.
I didn't use the key terms, but I hope this is a good start! (:
