William Dayton graduated from the College of New Jersey and studied law, subsequently becoming an attorney and judge. He spent nearly three decades in public service, including a term in the New Jersey Legislative Council and the United States Senate. Dayton held significant stances on economic and foreign policy issues, opposing tariff reduction and condemning the annexation of Texas. He served as Minister to France, where he played a pivotal role in preventing French intervention in the American Civil War.

William Dayton's political identity is marked by a distinctive blend of anti-slavery advocacy and economic protectionism. He opposed tariff reductions, arguing they would undermine farmers and businesses, while simultaneously condemning the annexation of Texas and the 1850 Compromise as tools to expand slavery. Dayton's diplomatic role in preventing French intervention during the Civil War further underscores his calculated approach to national interests.