The public mind had been already prepared for this event by Mr. Paine's celebrated pamphlet, Common Sense. There is good reason to believe that Dr. Franklin had no inconsiderable share at least in furnishing materials for this work.
In the convention which assembled at Philadelphia in 1776, for the purpose of establishing a new form of government for the State of Pennsylvania, Dr. Franklin was chosen president. The late constitution of this state, which was the result of their deliberations, may be considered as a digest of his principles of government. The single legislature and the plural executive seem to have been his favourite tenets.
In the latter end of 1776, Dr. Franklin was appointed to assist at the negotiation which had been set on foot by Silas Deane, at the court of France. A conviction of the advantages of a commercial intercourse with America, and a desire of weakening the British empire by dismembering it, first induced the French court to listen to proposals of an alliance. But they showed rather a reluctance to the measure, which, by Dr. Franklin's address, and particularly by the success of the American arms against General Burgoyne, was at length overcome; and in February, 1778, a treaty of alliance, offensive and defensive, was concluded; in consequence of which, France became involved in the war with Great Britain.
Perhaps no person could have been found more capable of rendering essential services to the United States at the court of France than Dr. Franklin. He was well known as a philosopher, and his character was held in the highest estimation. He was received with the greatest marks of respect by all the literary characters, and this respect was extended among all classes of men. His personal influence was hence very considerable. To the effects of this were added those of various performances which he published, tending to establish the credit and character of the United States. To his exertions in this way may, in no small degree, be ascribed the success of the loans negotiated in Holland and France, which greatly contributed to bringing the war to a happy conclusion.
The repeated ill success of their arms, and more particularly the capture of Cornwallis and his army, at length convinced the British nation of the impossibility of reducing the Americans to subjection. The trading interest particularly became clamorous for peace. The ministry were unable longer to oppose their wishes. Provisional articles of peace were agreed to, and signed at Paris, on the 30th of November, 1782, by Dr. Franklin, Mr. Adams, Mr. Jay, and Mr. Laurens, on the part of the United States, and by Mr. Oswald on the part of Great Britain. These formed the basis of the definitive treaty, which was concluded the 3d of September, 1783, and signed by Dr. Franklin, Mr. Adams, and Mr. Jay on the one part, and by Mr. David Hartly on the other.
On the 3rd of April, 1783, a treaty of Amity and Commerce between the United States and Sweden, was concluded at Paris by Dr. Franklin and the Count Von Krutz.
A similar treaty with Prussia was concluded in 1785, not long before Dr. Franklin's departure from Europe.
Dr. Franklin did not suffer his political pursuits to engross his whole attention. Some of his performances made their appearance in Paris. The objects of these were generally the promotion of industry and economy.
In the year 1784, when animal magnetism made great noise in the world, particularly at Paris, it was thought a matter of such importance that the king appointed commissioners to examine into the foundation of this pretended science. Dr. Franklin was one of the number. After a fair and diligent examination, in the course of which Mesmer repeated a number of experiments, in the presence of the commissioners, some of which were tried upon themselves, they determined that it was a mere trick, intended to impose upon the ignorant and credulous. Mesmer was thus interrupted in his career to wealth and fame, and a most insolent attempt to impose upon the human understanding baffled.
The important ends of Dr. Franklin's mission being completed by the establishment of American independence, and the infirmities of age and disease coming upon him, he became desirous of returning to his native country. Upon application to Congress to be recalled, Mr. Jefferson was appointed to succeed him in 1785. Some time in September of the same year Dr. Franklin arrived in Philadelphia. He was shortly after chosen a member of the supreme executive council for the city, and soon after was elected president of the same.