Final answer:
The similarities between the United States government and democracy in Athens include citizen participation, protection of individual rights, and a system of checks and balances.
Step-by-step explanation:
The similarities between the United States government and democracy in Athens include the concepts of citizen participation and representation. In both systems, citizens have the ability to participate in decision-making and elect representatives to act on their behalf. Additionally, both governments value the protection of individual rights and freedoms. Finally, both the United States government and democracy in Athens have a system of checks and balances to ensure the power is not centralized in one branch or individual.