I'm not sure in what context you mean, but think about how they act or their core characters. What standards do they follow? Any stereotypes? Are they predictable? If so, in what way?
The thesis statement is the first sentence of this paragraph, it should be the last sentence of an introductory paragraph.
Belives would work in you qustions
Your answer would be:
US citizens are required to (options not shown). (Voting) is a privilege that only US citizens can exercise, but it is not required.
hope this helps :)
