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Finally, the ambassadors concluded their task of keeping Europe not only out of American affairs but, indeed, out of the entire Western Hemisphere. In 1846 President Polk observed: “We must have California.” Since that Pacific littoral was part of Mexico, Polk provoked Mexico into a war with the United States. California, Arizona, and Utah were ceded two years later. More peacefully, the tidy-minded Polk acquired the Pacific Northwest by treaties with England. With the acquisition of Oregon, Washington, and Idaho, the Union now filled the continent from sea to shining sea. In 1867 the Russians sold us their icebox, Alaska, while Hawaii was annexed in 1898, along with Puerto Rico and the reluctant Philippines. While this filling in of vast spaces with neatly ruled new states, Secretary of State John Quincy Adams produced for President James Monroe a doctrine declaring that the two American continents were off limits to Europe, as Europe would be to us. In 1917, by entering World War I, we in effect voided the Monroe Doctrine. But that was to gain yet another world, one that is currently—optimistically—called “global.” Benjamin
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