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The U.S. have purchased these territories
(discuss.tchncs.de)
For the map enthused!
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Yeah, them inflation adjusted prices are very misleading (as general inflation stats usually are, but over such time periods it's basically irrelevant info & doesn't represent anything ... not to mention regular consumers weren't involved at all, and prices weren't 'market' to begin with).
Also you can't really say "purchase" if a war or at least a war threat was involved.