In fact, along the whole coast there was only one practice which deserved the name of a problem, and that was the institution of slavery. Against this, which existed both North and South, Crèvecoeur protested just as Samuel Sewall and John Woolman had done before him, and as Timothy Dwight and Joel Barlow in Connecticut and William Pinkney and other lawmakers and abolitionists in Maryland and Virginia were to do soon after him. Yet, however sincere he was, he regarded slavery only as an external blemish rather than as a national danger. It was a mistake, but not a menace. It was typical of the America of the future that Crèvecoeur should have had so unquestioning a confidence in the prospect. The belief in a "manifest destiny" for America, which is finely inspiring for all who will work to bring about a glorious future, has been demoralizing to millions who have used a lazy belief in it to excuse them from feeling or exercising any responsibility. With the twelfth letter came a total change of key. It was evidently written long after all the others, after the outburst of war, perhaps after his New Jersey property had been burned, possibly even during his return voyage to France in the autumn of 1780. As a naturalized subject of King George, when well on in middle life he had been forced to choose between his sworn allegiance and the interests of his fellow-colonists. He sympathized with the American cause, though he did not enlist. And then in the years that followed he learned (the perennial lesson of war time) of the "vanity of human wishes." Unhappily for the moral of the tale, the latter part of his life was far from heroic. In the concluding letter, written quite after the fashion of the most sentimental and unreal eighteenth-century nature lovers, Crèvecoeur decided to abandon the struggle in the war zone and to take up life anew with his family among the Indians in the West. He would forswear all talk of politics, "contemplate nature in her most wild and ample extent," and formulate among his adopted neighbors a new system of happiness. As a matter of fact, however, his retreat was even more complete than this; for he returned permanently to the Continent, lived contentedly in Paris, London, and Munich, married his daughter to a French count, wrote volumes on Pennsylvania and New York, and memorialized his career as a farmer by inditing a paper on potato culture.