Income and wealth inequality is unquestionably the most important economic issue of the contemporary world, yet few really understand its significance. Most of us very rarely interact with the very, very rich and therefore have no idea how wide the gap may be. Studies indicate that most Americans significantly underestimate the degree of inequality and it is very likely that those numbers represent the vast majority of people on the planet.
The negotiations in Switzerland between the P5+1 and Iran have passed the deadline, but the US and Iranian delegations are still at it. Other delegations have left, but both the US and Iran desperately need an agreement. The Washington Post has a very good article on the remaining issues–it is a fair and dispassionate account of what keeps the two sides apart.
World Politics News 
I would like to see the map of wealth distribution for the years 1900 and 1950 for comparison.
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We don’t have income data for 1900. All US income data begins with the first year of the Internal Revenue Service in 1913. Income distribution over that time period is as follows:
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