Here’s how the responses should be categorized:
Similarity Between United States and Roman Republic:
- The government had a written constitution.
- There was a system of checks and balances.
- The government could use a veto to cancel an action.
Difference Between United States and Roman Republic:
- Women could vote.
Note: "Women could vote" is a difference because, in the Roman Republic, women did not have the right to vote, whereas women in the United States have the legal right to vote (from the 19th Amendment onward).