Which constitutional amendment abolished the poll tax in federal elections?

The 24th Amendment to the United States Constitution specifically abolished the poll tax in federal elections. Ratified in 1964, this amendment was a significant step towards ensuring voting rights for all citizens, particularly for African Americans and poorer individuals, who were often disenfranchised by the requirement to pay a tax in order to vote. Poll taxes were used as a means to impose economic barriers, effectively limiting the electoral participation of certain groups, thus the abolition of this practice represented a move towards more equitable access to voting.

The other amendments listed have different focuses; for instance, the 15th Amendment addresses the prohibition of voting discrimination based on race, the 19th Amendment grants women the right to vote, and the 26th Amendment lowers the voting age to 18. Each of these amendments played a crucial role in shaping voting rights but does not directly address the issue of poll taxes in federal elections.