Assuming that you're referring to President Roosevelt, i think he believed that the government could best bring social and economic change.
This proved by his action when he signed the New Deal to handle the horrific depression in our coutnry
I think it becomes difficult because they all wanted to have more advantages than anyone else, that became too much for the country that they defeated. The Potsdam Conference became difficult because they have problems on the things that they should do with Germany that they want to completely disarm the country.
Answer:
The debate of slavery divided the country because of this lead to the civil war. The south was built on the principles of slavery, needing them to work and serve on plantations. The north was built on opportunities and chances relying on urbanisation. When Abraham Lincoln became president he set off to free the slaves " Being free is a human right" this angered many southerners who believed that slaves were less then humans. The south seceded the north because of this which sparked the civil war.