500
Citizens were unhappy with the Republic because the gap between the rich and the poor continually widened. What exactly caused that gap to widen (eventually leading to Julius Caesar taking over)?
What is
Soldiers were also farmers. They left their farms to fight and expand the empire. Many died in battle. Farmers who survived did not have enough money to re-start their farms.
Farms were bought by wealthy Romans. Gap between the rich and poor widens.
Ex-farmers become professional soldiers and fight for a salary, not for Rome. Result? Power-hungry generals and unhappy citizens.