What period is known for strong nationalism, economic growth, and territorial expansion during President Monroe's administration?

The Era of Good Feelings is characterized by a period of heightened nationalism, significant economic growth, and territorial expansion during President Monroe's administration from 1817 to 1825. This period followed the War of 1812 and is marked by a temporary consensus in American politics, primarily within the Democratic-Republican Party, as the Federalist Party declined.

During the Era of Good Feelings, the nation experienced a sense of unity and pride, which fostered nationalist sentiments among the populace. Economic growth was evidenced by the expansion of manufacturing and infrastructure projects, such as roads and canals facilitating trade and settlement. Additionally, territorial expansion was significant during this time, including events such as the acquisition of Florida from Spain in 1819 and the westward movement of settlers, which was influenced by the concept of Manifest Destiny.

The other options refer to different historical contexts: the Era of Reconstruction pertains to the post-Civil War period, the Age of Enlightenment focuses on philosophical ideas rather than American nationalism, and the Roaring Twenties relates to the prosperous decade following World War I. Thus, the Era of Good Feelings is the most appropriate choice for the described characteristics during Monroe's presidency.