"Oh, to be in England, now that April's there," Robert Browning wrote nearly two centuries ago in Home Thoughts from Abroad, but this April, Britons might pine for the riches of... Mississippi?Yes, Mississippi, if they take just a brief gander at the new Institute of Economic Affairs report on the comparative wealth between Britain, American states, and Britons' sad delusions about where they stand. According to the IEA, ask the typical Brit where his country ranks, income-wise, if it were a state. And the typical answer is "Seventh place."Not quite, old chap. The sad fact is that if Britain were...