While doing work for Franklin, Mazzei shared his idea of importing Tuscan products, wine and olive trees, to the New World.

[4] On September 2, 1773, Mazzei boarded a ship from Livorno to the Colony of Virginia, bringing with him plants, seeds, silkworms, and 10 farmers from Lucca.

He was also joined by a widow, Maria Martin, whom he married in 1778, and his friend Carlo Bellini who between 1779 and 1803 would become the first teacher of Italian at an American university, the College of William & Mary in Virginia.

Bisogna che ognuno sia uguale all'altro nel diritto naturale.Translated by Jefferson as follow: All men are by nature equally free and independent.

All men must be equal to each other in natural lawIn 1779, following the emergence of the independent United States after the colonial victory in the American Revolutionary War, Mazzei returned to Italy as a secret agent for Virginia.

His wife remained in the United States until her death in 1788 at the estate, which Mazzei had donated in 1783 to his stepdaughter, Margherita Maria Martini and to her husband, the Frenchman Justin Pierre Plumard, Count De Rieux.

[5] He wrote a political history of the American Revolution, Recherches historiques et politiques sur les États-Unis de l'Amerique septentrionale, and published it in Paris in 1788.

There he became acquainted with Polish liberal and constitutional thought, like the works of Wawrzyniec Grzymała Goślicki and ideas of Golden Freedoms and Great Sejm.

When Napoleon overthrew that government Mazzei returned definitively to Tuscany, settling in Pisa where in 1796 he married Antonina Tonini, with whom he had a daughter, Elisabetta, in 1798.

[10][A]n intimacy of 40. years had proved to me his great worth; and a friendship, which had begun in personal acquaintance, was maintained after separation, without abatement, by a constant interchange of letters.

Declaration of Independence was acknowledged by John F. Kennedy in his 1958 book A Nation of Immigrants, in which he states that:[14] The great doctrine 'All men are created equal'[15][16] and incorporated into the Declaration of Independence by Thomas Jefferson, was paraphrased from the writing of Philip Mazzei, an Italian-born patriot and pamphleteer, who was a close friend of Jefferson.

No one man can take complete credit for the ideals of American democracy.A 40-cent United States airmail stamp was issued in 1980 to commemorate the 250th anniversary of Mazzei's birth.

Bisogna che ognuno sia uguale all'altro nel diritto naturale.All men are by nature equally free and independent.