Final answer:
The two largest African Methodist Episcopal churches are not explicitly identified, but the AME Church was a significant Black church denomination formed to counter discrimination and support abolitionist work. Churches that grew to be the largest likely had substantial congregations and social-political involvement.
Step-by-step explanation:
The two largest African Methodist Episcopal (AME) churches are not specified in your question, given the vast history and spread of AME churches across the United States. The African Methodist Episcopal Church was one of the earliest and most significant Black church denominations in the U.S., formed in the 1790s by Richard Allen. This denomination arose in response to discrimination and segregation that African Americans faced within White-dominated Methodist Episcopal churches. These churches played a crucial role in opposing all forms of racism and supporting abolitionist political work to end slavery.
The AME Church was instrumental during the Free Church Movement, which not only countered pro-slavery religious teachings but also stood against the racism that was pervasive in both the North and the South. Leaders like Richard Allen understood the significance of religious and social autonomy for African Americans and, thus, pushed for independent African American places of worship.