U.S. currencys strength reflects Europes sovereign debt crisis.

Norwegian krone and Australian dollars to benefit from U.S., EU problems.

Norwegian krone and Australian dollars to benefit from U.S., EU problems.

The appetite for U.S. assets grows despite the threat of a downgrade.

The appetite for U.S. assets grows despite the threat of a downgrade.

Debt crisis in Europe is expected to staunch dollar's slide.

Debt crisis in Europe is expected to staunch dollar's slide.

U.S. currency's strong performance in May may prove fleeting.