The sharp decline of the U.S. dollar since 2000 is affecting a broad swath of the world's population, with its drop on global markets being blamed at least in part for misfortunes as diverse as labor strikes in the Middle East, lost jobs in Europe and the end of an era of globe-trotting rich Americans.

It marks a shift for Americans in the global economy. In times of strength, a mightier dollar allowed Americans to feed their insatiable appetite for foreign goods at cheap prices while providing Yankees abroad with virtually unrivaled economic clout. But now, as the United States struggles to fend off a recession, observers say the less lofty dollar is having both a tangible and intangible diminishing effect.

"The dollar was the dominant force in world economics for 100 years -- we had no competition," said C. Fred Bergsten, an American economist and director of the Washington-based Peterson Institute for International Economics. "There was no other economy close to the size of the United States. But all that is now changing."

The dollar is down more than 40 percent against the euro over the past seven years, taking a particularly sharp drop last month. Despite a bit of a rebound in recent weeks, the dollar is still off nearly 12 percent since Jan. 11, when it hit its peak for 2007.

For now, that drop is allowing the U.S. economy to reap rewards. American products have become exceedingly competitive, boosting exports ranging from Caterpillar tractors to Boeing jumbo jets that are now relative blue-light specials in the global marketplace. Using the same logic of chasing cheaper local production costs that has driven many U.S. factories to China, a few iconic European companies, including Airbus, are set to shift some manufacturing lines to the United States.