The three most powerful of Spain's rivals waged many a long war with one another to decide which should grasp the sceptre that had slipped from Spanish hands. The fleets of Holland fought with stubborn obstinacy to wrest from England her naval supremacy; but they failed, and in the end the greater portion of the Dutch domains fell to their foes. The French likewise began a course of conquest and colonization at the same time the English did, and after a couple of centuries of rivalry, ending in prolonged warfare, they also succumbed. The close of the most important colonial contest ever waged left the French without a foot of soil on the North American mainland; while their victorious foes had not only obtained the lead in the race for supremacy on that continent, but had also won the command of the ocean. They thenceforth found themselves free to work their will in all seagirt lands, unchecked by hostile European influence. Most fortunately, when England began her career as a colonizing power in America, Spain had already taken possession of the populous tropical and subtropical regions, and the northern power was thus forced to form her settlements in the sparsely peopled temperate zone. It is of vital importance to remember that the English and Spanish conquests in America differed from each other very much as did the original conquests which gave rise to the English and the Spanish nations. The English had exterminated or assimilated the Celts of Britain, and they substantially repeated the process with the Indians of America; although of course in America there was very little, instead of very much, assimilation. The Germanic strain is dominant in the blood of the average Englishman, exactly as the English strain is dominant in the blood of the average American. Twice a portion of the race has shifted its home, in each case undergoing a marked change, due both to outside influence and to internal development; but in the main retaining, especially in the last instance, the general race characteristics.