Which amendment allowed residents of Washington D.C. to vote in presidential elections?

The 23rd Amendment to the United States Constitution was ratified in 1961 and specifically allows residents of Washington D.C. to vote in presidential elections. Prior to this amendment, citizens living in the nation's capital were unable to participate in these elections due to the lack of representation in Congress. The 23rd Amendment provides D.C. with a number of electoral votes equal to that of the least populous state, thereby ensuring that its residents have a voice in the selection of the President and Vice President. This was an important step in addressing the democratic deficit experienced by Washington D.C. residents, making it a significant amendment in terms of voting rights and representation. The other amendments listed relate to different aspects of voting rights and governance but do not address the specific right of D.C. residents to vote in presidential elections.