The changes in party affiliation over the past forty years were reflected in the fact that by 2014 there were more and more Texans who identified themselves as Republicans than as Democrats.
This happened in the 1970s and 1980s, when Texas saw more and more migration, migrants who had a more Republican bend than the democratic one. This changed the political dynamics in Texas.
Moreover, Texas saw a decline in the conservative Democrats, who could hold the party together. Taking into consideration, both the parallel running reasons, within the next forty years, Texas actually became a Republican state, where the Democrats have to fight hard to be in power.
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