Imagine when Dallas was once a conservative city. When did that end? With the assassination of 1963 or later?
When unconstitutional "civil rights" gave certain people special rights to nullify our freedoms.
It ends for all cities; when a cluster of people get accustomed to having others take care of everything for them (including paying for everything), the dependency causes liberals to flourish.
Rural America, while a small part of the total population, offers nothing to people who would just starve/freeze to death without someone to warm and feed them...