Mifflin's most important duty as president was to accept on behalf of Congress the resignation of General George Washington on December 23, 1783. After the war, the importance of Congress declined so precipitously that Mifflin found it difficult to convince the states to send enough delegates to Congress to ratify the Treaty of Paris, which finally took place on January 14, 1784, at the Maryland State House in Annapolis. He also appointed Thomas Jefferson as a minister to France on May 7, 1784, and he appointed his former aide, Colonel Josiah Harmar, to be the commander of the First American Regiment.
Mifflin's most important duty as president was to accept on behalf of Congress the resignation of General George Washington on December 23, 1783. After the war, the importance of Congress declined so precipitously that Mifflin found it difficult to convince the states to send enough delegates to Congress to ratify the Treaty of Paris, which finally took place on January 14, 1784, at the Maryland State House in Annapolis. He also appointed Thomas Jeffers,on as a minister to France on May 7 1784, and he appointed his former aide, Colonel Josiah Harmar, to be the commander of the First American Regiment.