Answer: 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.