The British Government under Canning offered to co-operate with the United States in stopping the extension of this threatening principle of intervention to the New World. Britain announced that she recognised the sovereignty of the Latin republics in South America. Meanwhile President Monroe acted independently and issued his message to Congress proclaiming the principles later known as the Monroe Doctrine. This famous Doctrine, as has been related, was at once a warning against interference on the part of any European Powers in the New World and a statement of the intention of America to play no part in European politics. With this valedictory message America concentrated upon her own affairs. A new generation of politicians was rising. The old veterans, of the days of the Constitution had most of them vanished from the scene, though Jefferson and Madison lingered on in graceful retirement in their Virginian homes.