How was western expansion apart of the "era of good feelings"?

The "Era of Good Feelings" was a time period that lasted from 1817 to 1825. This era in the US reflected the unity, purpose and high moral of all Americans after end of the war of 1812.

It was an era where the  Democratic-Republicans split into two parties; The northern-dominated Republicans and the southern-dominated Democrats and because both parties were originally a single one it led to are more stable government with very few political quarrels.

As such President James Monroe (1817-1825) saw as only natural to expand the national power of the United States and so it turned to the west to expand on the vast lands and resources this region had, this was due in part to the Louisiana Purchase in 1803.  This expansionism took advantage of the high morale after winning The war of 1812 and The Second Barbary War of 1815.

for the united states of america, 1945 to 1964 was a time of high economic growth and general prosperity. it was also a time of confrontation as the capitalist united states and its allies politically opposed the soviet union and other communist countries; the cold war had begun.

explanation:

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)