Since the late twentieth and early twenty-first centuries, the border region, including el paso, mcallen, and brownsville, has remained politically a bastion.
a. democratic partyb. competitive two-partyc. republican partyd. tea partye. liberal and tea party

a. Democratic Party

Explanation:

The Democratic Party, as well as the Republican Party, is one of the major modern political parties in the US. The Democratic Party is the oldest active political party in the world, as it was established in 1828 Andrew Jackson´s supporters.  

Following the Civil Rights Act of 1964 and the Voting Rights Act of 1965, the Southern states became mostly Republican supporters in presidential elections, while the Northeastern states became more reliably Democratic.

However, the border region that includes El Paso, McAllen, and Brownsville, has remained a Democratic Party bastion.

i dont know sorry why dont you looking it up on google

answer; motor learning;