Many more Americans attend college today than in the 1900s, which best exemplifies
Cohort Effects.
This is mostly due to checks and balances. For example, the veto. The president can veto a bill, but if 2/3rds of the senate and the house both want the bill to pass, then the president cannot veto this bill.
steam power
Fueled by the game-changing use of steam power, the Industrial Revolution began in Britain and spread to the rest of the world, including the United States, by the 1830s and '40s.
Once a slave ship had a full cargo of enslaved Africans, the captain would set out on the next leg of the journey. This leg, called the Middle Passage , took the Africans away from their homeland, across the Atlantic Ocean to the Americas.
