Final answer:
The Republican Party remains strong in the Sun Belt. The American political system is dominated by two parties, the Democrats and Republicans, with the Democrats and Whigs constituting the Second Party System.
Step-by-step explanation:
The party that remains strong in the Sun Belt is the b) Republican Party. This region, which stretches across the southern and southwestern United States, has traditionally seen significant support for the Republican Party. In recent decades, this area has been characterized by rapid economic growth and demographic changes, influencing political shifts and strategies within the region.
In regards to other parts of the question, the American political landscape has been dominated by a two-party system consisting of the Democratic Party and the Republican Party, making it challenging for third-party candidates to achieve success in national elections. The Second Party System mentioned in the reference information consisted of the c) Democrats and Whigs. Additionally, it is important to note that the election of 1828 brought in the first presidency of the A) Democratic Party with Andrew Jackson.