What were the three main issues that led to the creation of third parties during this antebellum era?

The three main issues that led to the creation of third parties during the Antebellum era are (1) slavery, (2) the American system, and (3) people's rights. The Antebellum era pertains to the period in the history of America before the civil war and after the 1812 War. In this period, the country was divided into those who supported slavery and those who want to abolish it.