Key Amendments Beyond the Bill of Rights

13th (1865) — Abolished slavery

14th (1868) — Equal citizenship, due process, equal protection

15th (1870) — Right to vote regardless of race

16th (1913) — Congress can collect income tax

17th (1913) — Direct election of U.S. Senators by popular vote

18th (1919) — Prohibition (alcohol banned)

19th (1920) — Women's right to vote

21st (1933) — Prohibition repealed

22nd (1951) — President limited to two terms

24th (1964) — Abolished poll taxes in federal elections

26th (1971) — Voting age lowered to 18

Q: What amendment gave women the right to vote?
A: The 19th Amendment

Q: What amendment lowered the voting age to 18?
A: The 26th Amendment

Q: How many amendments does the Constitution have?
A: 27

Reference:

Wikipedia: Constitutional Amendments

https://en.wikipedia.org/wiki/List_of_amendments_to_the_United_States_Constitution