Politics became more of an active interest for Franklin in the 1750s. In 1757, he went to England to represent Pennsylvania in its fight with the descendants of the Penn family over who should represent the Colony. He remained in England to 1775, as a Colonial representative not only of Pennsylvania, but of Georgia, New Jersey and Massachusetts as well.
Franklin's big break with England occurred in the "Hutchinson Affair." Thomas Hutchinson was an English-appointed governor of Massachusetts. Although he pretended to take the side of the people of Massachusetts in their complaints against England, he was actually still working for the King. Franklin got a hold of some letters in which Hutchinson called for "an abridgment of what are called English Liberties" in America. He sent the letters to America where much of the population was outraged. After leaking the letters Franklin was called to Whitehall, the English Foreign Ministry, where he was condemned in public.
Franklin then came back home where he was elected to the Second Continental Congress and worked on a committee of five that helped to draft the Declaration of Independence. Though much of the writing is Thomas Jefferson's, much of the contribution is Franklin's. In 1776 Franklin signed the Declaration, and afterward sailed to France as an ambassador to the Court of Louis XVI.
In part due to Franklin's popularity, the government of France signed a Treaty of Alliance with the Americans in 1778. Franklin also helped secure loans and persuade the French they were doing the right thing. Franklin was on hand to sign the Treaty of Paris in 1783, after the Americans had won the Revolution.