He was a Patriot leader in Philadelphia during the American Revolution, original signer of the Declaration of Independence, and the secretary of the Continental Congress (1774–1789) throughout its existence.
Thomson became a leader of Philadelphia's Sons of Liberty.
In his later years, after his retirement from public office in 1789, Thompson was asked to write a history of the America Revolution (1775-81), by which the United States definitely separated themselves from British dominion, because as a leader in it he was familiar with its hidden history. However, he surprised those urging him to commit his memory and experience to paper by refusing to document the events surrounding the Revolution, even destroying the secret journals he kept during the fighting of the Revolution and the arguing of the Constitution, because if the truth were known, he said, many glittering careers would be tarnished and the national leadership weakened. Thus, Thompson declared on the matter of him writing an account of the world-transforming event:
"No.” he replied. according to Dr. Benjamin Rush. “I ought not, for I should contradict all the histories of the great events of the revolution,and show by my account of men, motives and measures, that we are wholly indebted to the agency of Providence for its successful issue. Let the world admire the supposed wisdom and valor of our great men. Perhaps they may adopt the qualities that have been ascribed to them, and thus good may be done. I shall not undeceive. future generations."
He mostly likely is referring to the occult and secret societies influences that where behind the founding of America.
Thomson's Great Seal proposal; a modified version was accepted.
