Regional Tensions in the Era of Good Feelings

During the early 19th century, the United States experienced a period often referred to as the 'Era of Good Feelings.' This time was marked by a sense of national unity and political harmony following the War of 1812. However, not all aspects of this period were free from strife and division. The question explores key developments and implications of this era.

Which of the following developments during the 'Era of Good Feelings' most significantly contributed to the emergence of regional tensions within the United States?