The "Era of Good Feelings" refers to a period in American history from approximately 1815 to 1825, characterized by a sense of national unity and political harmony following the War of 1812. During this time, the Democratic-Republican Party dominated politics, leading to a decline in partisan conflict and the absence of significant opposition. Economic growth and territorial expansion marked this era, with the United States experiencing increased industrialization and infrastructure development. The period also saw the rise of nationalism, as exemplified by the Monroe Doctrine, which asserted American interests in the Western Hemisphere and discouraged European intervention.