According to Ellis, why were the founders successful in creating a viable republic in the late 1700s

Just like actors in a play, the founding fathers were in their best behavior because they knew that their actions would have a significant effect on the next generations.

Explanation:

Ellis who was a book author described the founding fathers in America as actors in a play. During the 1700s there were many issues which were to shape the country called America one of which is slavery and equal rights of citizens. The founding fathers were diplomatic in handling these issues. The close-knit relationships and inter-connectedness of their jobs also allowed them to work together to achieve their common goals.

Moreso, they understood that their efforts would affect generations to come. So, they put in their best for the greater good of those who were to come.