Final answer:
In Australia, voting is mandatory with potential fines, while in the United States it is voluntary with no penalties for not voting.
Step-by-step explanation:
In Australia, citizens are required to vote in elections and may have to pay a fine if they do not vote. However, in the United States, voting is a civic responsibility but is not mandatory. Instead, people in the United States are required to register to vote but voting itself is voluntary. There is no penalty for not voting in the United States.
Learn more about Voting requirements in Australia and the United States