Final answer:
James Monroe's tenure, marked by political unity and dominance of the Democratic-Republican Party, is commonly known as the 'Era of Good Feelings'.
Step-by-step explanation:
James Monroe's tenure as the President of the United States is referred to as the 'Era of Good Feelings'. This description is due to the situation of relative political unanimity that marked his presidency, specifically following the decline of the Federalist Party, which began under Jefferson. This resulted in a period of single-party rule, with the Democratic-Republicans becoming the dominant political force. Monroe's two successive terms in office, from 1817 to 1825, paved the way for what historians call the 'Era of Good Feelings', lasting from 1815 to 1828. This period marked an era of one-party government, with reduced political conflicts and a focus on national growth and expansion.
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