BUENOS AIRES, Argentina -- U.S. Treasury Secretary Paul O'Neill met with President Eduardo Duhalde and business executives Tuesday to discuss the general unraveling of Argentina's economy, including its debt default, currency devaluation and 22 percent unemployment rate. As O'Neill arrived from Uruguay -- where he praised that country for how it handled its banking crisis -- about 1,500 demonstrators marched through the Argentine capital, Buenos Aires, burning an American flag and holding signs saying, "Yankees, get out of Latin America!" Many here blame free market systems for failing to end the poverty of half of Argentina's 36 million people. The...