Why were amendments needed to expand voting rights

"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❤

hold on ill go look