Answer:
The era of good feelings was bad because of:
1) Panic of 1819, which caused significant economic disruption to the US and around the world
2) Arising slavery issues... Missouri Compromise, the Tallmadge Amendment, meant to prohibit slavery in the west failed to pass leaving the West open for future issues
3) North and South rivalry... North had more population, so more representation in the House, but the Land Act of 1820 made West land cheap, decreasing North population, and therefore also there representation in the House
The South had held 5 out of the past 6 presidents when the era closed, with 5 being from Virginia. The North saw this "Virginia Dynasty" as unfair