When the passage of the Stamp Act in 1765 startled the American colonies out of their provincial sense of security and made them aware of their real attitude toward the mother country, Franklin was in London. Eleven years earlier, in 1754, he had offered a plan for the Union of the Colonies, but this had not contemplated separation from England. It was rather what we should call a scheme for imperial federation under the British Crown. We may use his word union, however, in a different field from that of politics. How much union of sentiment, of mental and moral life, of literary, educational, and scientific endeavor, was there in the colonies when the hour of self-examination came? Only the briefest summary may be attempted here. As to race, these men of the third and fourth generation since the planting of the colonies were by no means so purely English as the first settlers. The 1,600,000 colonists in 1760 were mingled of many stocks, the largest non-English elements being German and Scotch-Irish--that is, Scotch who had settled for a while in Ulster before emigrating to America. "About one-third of the colonists in 1760," says Professor Channing, "were born outside of America." Crèvecœur's Letters from an American Farmer thus defined the Americans: "They are a mixture of English, Scotch, Irish, French, Dutch, Germans, and Swedes. From this promiscuous breed that race now called Americans has arisen." The Atlantic seaboard, with a narrow strip inland, was fairly well covered by local communities, differing in blood, in religion, in political organization--a congeries of separate experiments or young utopias, waiting for that most utopian experiment of all, a federal union. But the dominant language of the "promiscuous breed" was English, and in the few real centers of intellectual life the English tradition was almost absolute.