But power, war, conquest, give rights, which, after possession, are conceded by the world, and which can never be controverted by those on whom they descend. We proceed, then, to the actual state of things, having glanced at their origin; because holding it in our recollection might shed some light on existing pretensions. The great maritime Powers of Europe discovered and visited different parts of this continent at nearly the same time. The object was too immense for any one of them to grasp the whole; and the claimants were too powerful to submit to the exclusive or unreasonable pretensions of any single potentate. To avoid bloody conflicts, which might terminate disastrously to all, it was necessary for the nations of Europe to establish some principle which all would acknowledge, and which should decide their respective rights as between themselves. This principle, suggested by the actual state of things, was, "that discovery gave title to the Government by whose subjects or by whose authority it was made, against all other European Governments, which title might be consummated by possession."[6] [6] 8th Wh. 573. This principle, acknowledged by all Europeans, because it was the interest of all to acknowledge it, gave to the nation making the discovery, as its inevitable consequence, the sole right of acquiring the soil and of making settlements on it. It was an exclusive principle, which shut out the right of competition among those who had agreed to it; not one which could annul the previous rights of those who had not agreed to it. It regulated the right given by discovery among the European discoverers; but could not affect the rights of those already in possession, either as aboriginal occupants, or as occupants by virtue of a discovery made before the memory of man. It gave the exclusive right to purchase, but did not found that right on a denial of the right of the possessor to sell. The relation between the Europeans and the natives was determined in each case by the particular government which asserted and could maintain this pre-emptive privilege in the particular place. The United States succeeded to all the claims of Great Britain, both territorial and political, but no attempt, so far as is known, has been made to enlarge them. So far as they existed merely in theory, or were in their nature only exclusive of the claims of other European nations, they still retain their original character, and remain dormant. So far as they have been practically exerted, they exist in fact, are understood by both parties, are asserted by the one, and admitted by the other.