Two important precedents that were established for Federal government was the Federal court system and the President's cabinet.
Hope this helps :)
Problems they faced were coming back to America, without any food and money , also they suffered loss of friends and family who were also in the war. A country usually has to recoup after a war, which usually causes an increase in poverty and homelessness. So summarily the freedman had to build their lives again and adapt to the new environment of America.
Dog went up the hill and sat on the log