Final answer:
Only natural-born citizens and naturalized citizens of the United States who are eighteen years of age or older have the legal right to vote. Legal aliens, illegal aliens, and those under the age of eighteen are not eligible to vote.
Step-by-step explanation:
In the United States, the groups of people who can legally vote are natural-born citizens and naturalized citizens. Legal aliens, illegal aliens, and people over age sixteen who are not yet eighteen are not eligible to vote. The right to vote is protected by amendments to the U.S. Constitution, including the 14th Amendment which defines citizenship, and the 26th Amendment which sets the voting age to 18 years and older. Furthermore, states may have specific guidelines, such as restrictions on voting for those with felony convictions or other criteria that might temporarily or permanently bar individuals from voting.