Final answer:
After the War of 1812, the period known as the 'Era of Good Feelings' signified a temporary increase in national unity and a decrease in political divisions, although it was not entirely free from underlying tensions. Policies that supported economic growth and solidified American foreign interests, like the Monroe Doctrine, were significant during this time.
Step-by-step explanation:
After the War of 1812, Americans indeed felt a resurgence of national unity which is characterized by the term 'Era of Good Feelings'. This period saw a decline in partisan politics as the Federalist Party dissolved, leading to a one-party system dominated by the Democratic-Republicans. The Era of Good Feelings, however, was not completely harmonious; issues such as the Panic of 1819 and the Missouri Compromise sowed the seeds for future divisions. Nonetheless, the immediate aftermath of the war was marked by a sense of national pride and political cooperation.
James Monroe's administration worked on strengthening the nation through economic policies, including the establishment of the Second Bank of the United States and the implementation of a protective tariff, designed to foster self-sufficiency. In terms of foreign policy, the Monroe Doctrine was a critical development during this era, asserting American interests in the Western Hemisphere and limiting European interference.
Considering the positive surge in national unity directly after the War of 1812, the statement is generally considered to be true. However, the tranquility was not absolute and was eventually disrupted by underlying regional and economic tensions that emerged during the period.