There are, however, two other alleged reasons which may have had a leading part in preventing politicians and statesmen from entering upon the necessary legislation. The first is the hazard or imagined peril to the safety of the Republic from "The Man on Horseback," a military leader placed officially at the head of a large body of well organized troops. This might be briefly answered with the truthful statement that at least two such men--Washington and Grant, and perhaps a third, Jackson--have had it clearly within their power to become dictators, and that the Republic as long as it survives will always regard them as the very safest of the many custodians of its liberties, while other leaders in the forum have attempted in vain their destruction. The second is the great and lapsing question of "State's Rights," which at first had much force and reason, but is now fast losing all possibility of maintenance, and must eventually give way to the changed conditions and the much greater mutual interests of the States involved. This doctrine had much right and reason in the earlier days of the Republic, because the States then, by reason of the comparative non-migration of their citizens and the transportation of products and commodities from one to the other, and the distinct characteristics of their people in habits and customs of business, might almost be said to differ from each other as did the baronies of Scotland in the Middle Ages, and required almost as autonomous laws for their government. But gradually their wonderfully increased population, the unparalleled advances in steam transportation, the great multiplication of their products and commodities (in one part or another of the Republic almost everything useful being produced) have so stimulated travel and commerce that they have so far lost their original individuality, that the individual citizen of each State in his daily wants and affairs, is quite as much interested in the laws, customs and business of other States, as in those of his own. Judging by the past, within the next half century the Republic will contain over 200,000,000 people and scores of cities of over a million inhabitants; greater and broader-tracked railroads with easier grades and curves and swifter speed, interchanging swiftly and cheaply the commodities of Florida with Alaska, and California with Maine; great ocean ship-canals with single locks connecting the Great Lakes with the ocean via the Hudson and Mississippi rivers. The humblest citizen of the Republic will then have a daily interest in the protection of these great properties and the lives of the men who maintain them in operation, which can only be accomplished by a strong, united and well-sustained Federal force supported by the States.