Here is Henry James describing Americans’ energy and love of work via his hero Christopher Newman, in the novel, The American:

Exertion and action were as natural to him as respiration; a more completely healthy mor­tal had never trod the elastic soil of the West. His experience, moreover, was as wide as his capacity; when he was fourteen years old, necessity had taken him by his slim young shoulders and pushed him into the street, to earn that night’s supper. He had not earned it; but he had earned the next night’s, and afterwards, whenever he had had none, it was because he had gone without it to use the money for something else, a keener pleasure or a finer profit. He had turned his hand, with his brain in it, to many things; he had been enterprising, in an eminent sense of the term; he had been adventurous and even reckless, and he had known bitter failure as well as brilliant success; but he was a born experimentalist, and he had always found something to enjoy in the pressure of necessity, even when it was as irritating as the haircloth shirt of the mediaeval monk.