Final answer:
Younger voters, urban regions, and more liberal areas such as the Northeast and West Coast are demographics that tend to align with the Democratic Party in recent years, reflecting shifts in the political landscape due to historical social movements and ideological changes.
Step-by-step explanation:
In recent years, demographics that tend to be Democrats include younger voters, who are increasingly choosing to affiliate with the Democratic Party over independent status or the Republican Party. Legislative control and political alignment tend to be divided along geographical and ideological lines. Urban areas and regions such as the Northeast and the West Coast are more likely to support the Democratic Party, reflecting a more liberal political ideology, whereas the South and large parts of the Midwest, which are more conservative and rural, often lean Republican. Historical shifts such as the civil rights movement, social issues of the 1960s, and the Reagan Revolution in the 1980s have contributed to the current political landscape, with southern traditionalists and those favoring smaller government tending to align with the Republican Party.