What issues divided the country at the end of the era of good feelings?

What divided the country in the era of good feelings was the sectionalism created by regional differences, where each population became loyal to its region.

Explanation:

The Era of Good Feelings was a historic period in the USA representing the feeling of unity among the American population after the war of 1812. This era was marked by little contention between political parties and the union of these countries in favor of the country's growth. However, even with the feeling of unity, sectionalism has become high in the country, this is because the population has become so loyal to their region to the point of ignoring or overriding the wishes of other regions to defend the desires of their home.

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