What amendment gave voting rights to people in dc and Columbia?

The 23rd Amendment to the United States Constitution, ratified in 1961, granted voting rights to residents of Washington, D.C., by allowing them to participate in presidential elections. It provided D.C. with electors in the Electoral College, equal to the least populous state, enabling its citizens to vote for President and Vice President. However, it did not grant D.C. full representation in Congress.