Answer: Universalistic norm
Step-by-step explanation:
A Universalistic norm is an activity that is available to all people or almost all people instead of being limited to a certain type or variety of people.
Voting in the US is open to all citizens above the age of 18 regardless of their religion, gender, affiliation or race without discrimination making it an activity that almost all (above age 18 only) people can participate in thereby qualifying it to be accepted as a Universalistic norm.