Politics are to the left of your rural hometown
It is likely that compared to your small rural hometown, moving to a big city means coming into more frequent contact with different worldviews and political perspectives. Notably, cities in general tend to fall further to the left on the political spectrum.
According to a recent Pew Research Center report, 62% of adults living in urban areas lean Democrat and 31% lean Republican. By contrast, 38% of adults living in rural areas lean Democrat and 54% lean Republican.