Decades before President Bush decided to teach Iraq a lesson, George F. Kennan worried that what he called our “monster country” would, through the “hubris of inordinate size,” inevitably become a menace, intervening all too often in other nations’ affairs: “There is a real question as to whether ‘bigness’ in a body politic is not an evil in itself, quite aside from the policies pursued in its name.”

Kennan proposed that devolution, “while retaining certain of the rudiments of a federal government,” might yield a “dozen constituent republics, absorbing not only the powers of the existing states but a considerable part of those of the present federal establishment.”

Regional devolution would most likely be initiated by a very large state with a distinct sense of itself and aspirations greater than Washington can handle. The obvious candidate is California, a state that has the eighth-largest economy in the world.

If such a state decided to get serious about determining its own fate, other states would have little choice but to act, too. One response might be for an area like New England, which already has many regional interstate arrangements, to follow California’s initiative — as it already has on some environmental measures. And if one or two large regions began to take action, other state groupings in the Northwest, Southwest and elsewhere would be likely to follow.

A new wave of regional devolution could also build on the more than 200 compacts that now allow groups of states to cooperate on environmental, economic, transportation and other problems. Most likely, regional empowerment would be popular: when the Appalachian Regional Commission was established in 1965, senators from across the country rushed to demand commissions to help the economies and constituencies of their regions, too.

Governor Schwarzenegger may not have thought through the implications of continuing to assert forcefully his “nation-state” ambitions. But he appears to have an expansive sense of the possibilities: this is the governor, after all, who brought Prime Minister Tony Blair of Britain to the Port of Long Beach last year to sign an accord between California and Britain on global warming. And he may be closer to the mark than he knows with his dream that “California, the nation-state, the harmonious state, the prosperous state, the cutting-edge state, becomes a model, not just for the 21st-century American society, but for the larger world.”