Final answer:
The Petticoat affair during President Andrew Jackson's administration involved societal backlash against the marriage of his friend Senator John Eaton to Peggy O'Neale Timberlake, reflecting social tensions and the importance of loyalty within Jackson's circle.
Step-by-step explanation:
The Petticoat affair, a well-known scandal during Andrew Jackson's presidency, centered on the marriage of his friend Senator John Eaton to Margaret ("Peggy") O'Neale Timberlake and the ensuing societal fallout.
President Jackson defended Peggy, paralleling her situation with the attacks against his own late wife, Rachel, and his resulting dedication to the Eaton's social acceptance shines a light on the themes of loyalty, honor, and social conflict within his administration. This led to a division in Washington society and contributed to the eventual ostracism of Vice President Calhoun from Jackson's inner circle, in favor of Martin Van Buren, who supported the Eatons.