Moving boxes sit stacked near a Century 21 Real Estate LLC for sale sign outside of a home in Princeton, Illinois, U.S., on Wednesday, May 30, 2012. The number of Americans signing contracts to buy previously-owned homes fell in April by the most in a year, indicating the U.S. housing recovery remains uneven. Photographer: Daniel Acker/Bloomberg
Daniel Acker Moving boxes sit stacked near a Century 21 Real Estate LLC for sale sign outside of a home in Princeton, Illinois, U.S., on Wednesday, May 30, 2012. The number of Americans signing contracts to buy previously-owned homes fell in April by the most in a year, indicating the U.S. housing recovery remains uneven. Photographer: Daniel Acker/Bloomberg

When Americans move, it is to find a new job, less expensive housing or a warmer climate -- and not, as is often suggested, to find a state with lower or no income taxes.

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