It banned the trading of slaves in DC but not slavery and said that all escaped slaves were to be returned to their masters
Answer: The 19th century saw much social change; slavery was abolished, and the First and Second Industrial Revolutions (which also overlap with the 18th and 20th centuries, respectively) led to massive urbanization and much higher levels of productivity, profit and prosperity.
The 3/5 compromise said slaves only counted for 3/5 of a human which meant states with more states had a higher population.
The answer would have to be that A. both empires were attacked by foreign invaders.