Significant Development in the Era of Good Feelings

During the early 19th century, the period known as the 'Era of Good Feelings' followed the War of 1812. This era was characterized by a sense of national unity, fewer political divisions, and economic growth. The presidency of James Monroe is often associated with this time, as he sought to unite the nation's various factions under a single banner of nationalism. However, certain events and issues began to reveal underlying tensions that would later challenge this era of unity.

Which of the following best describes a significant event or development during the 'Era of Good Feelings'?