Answer:
"The Fifteenth Amendment granted the right to vote to former slaves and people of color. The Nineteenth Amendment gave the vote to women, while the Twenty-third, Twenty-fourth, and Twenty-sixth amendments gave representation to the District of Columbia, forbid poll taxes, and lowered the voting age to 18, respectively. The passage of each of these Amendments reflected a shift towards making voting a right of all citizens, and indeed a fundamental part of citizenship."
this was copied from a website to give you some context
I would say the amendments were the rules that the US implemented and by adding new amendments to give people certain rights it can expand voting rights
I hope this helps❤