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Blaine And Pan-Americanism.
During the half century that intervened between John Quincy Adams and James G.Blaine, the Monroe Doctrine, it was commonly believed, had prevented the expansion of the territories of European powers in the Americas.

It had also relieved the United States both of the necessity of continual preparation for war and of that constant tension in which the perpetual shifting of the European balance of power held the nations of that continent.

But the Monroe Doctrine was not solely responsible for these results.

Had it not been for the British Navy, the United States would in vain have proclaimed its disapproval of encroachment.
Nor, had Europe continued united, could the United States have withstood European influence; but Canning's policy had practically destroyed Metternich's dream of unity maintained by intervention, and in 1848 that whole structure went hopelessly tumbling before a new order.