Key Development of the Era of Good Feelings

The 'Era of Good Feelings' was a period in American history marked by a sense of national unity and political harmony, primarily following the War of 1812. During this time, the Democratic-Republican Party emerged as the dominant political force in the country. However, this period also saw the emergence of sectional tensions that foreshadowed future conflicts.

Which of the following developments is most closely associated with the Era of Good Feelings?