How have voting amendments changed american society?
they have limited the right to vote to certain groups of people.
they have expanded the right to vote to more and more people.
they create rules around who is eligible to vote to protect elections.
they create laws that no state or local office can hold their own elections.

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explanation:

on my last

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."

this is a good question! i'll do some research and come back when i have the answer!