The main outcome of the Twenty-Third Amendment pertains to which group?

The Twenty-Third Amendment specifically grants residents of Washington D.C. the right to vote in presidential elections. Prior to this amendment, people living in the nation's capital were not allotted any electoral votes, which meant they could not participate in the selection of the President and Vice President. The amendment ensures that Washington D.C., while not a state, has a voice in the presidential election process by allowing it to have electoral votes equivalent to the least populous state. This inclusion was significant in expanding democratic participation and acknowledging the unique status of the District of Columbia in the federal system.