Which amendment provides for D.C. representation in the Electoral College?

The 23rd Amendment to the United States Constitution is the amendment that provides for representation of Washington, D.C. in the Electoral College. Ratified in 1961, this amendment allows the District of Columbia to participate in presidential elections by granting it three electoral votes, equivalent to the number of electors that the least populous state has. This was a significant development because prior to the 23rd Amendment, residents of D.C. did not have a vote in presidential elections, despite being subject to federal laws and taxes. By allowing D.C. electoral votes, the amendment aimed to provide a voice to its residents in the presidential selection process, reflecting the democratic principle that those governed should have a say in their government.

The other amendments listed do not address D.C. electoral representation. The 16th Amendment pertains to income tax, the 19th Amendment grants women the right to vote, and the 26th Amendment lowers the voting age to 18. Each of these amendments serves different purposes unrelated to the representation of Washington, D.C. in presidential elections, which is specifically addressed by the 23rd Amendment.