Answer:
Republican Party
Step-by-step explanation:
Initially, during the administration of President J.F. Kennedy, and Johnson, around the early 1950s till the early 1960s, about 80 percent of Texans favored the Democratic Party, due to the policies of the Presidents at the time.
However, the conservative rejection of civil rights policies has increased Texans' support for the Republican Party, thereby reduced the support for the Democratic Party in the present time.
Hence, it can be concluded that the sorting of the parties by ideology drove conservative Texans toward the Republican Party.