I find it fascinating that the US could change colour to color which seems a completely useless and trivial change but still hasn't managed to adopt the interna

I find it fascinating that the US could change colour to color which seems a completely useless and trivial change but still hasn't managed to adopt the international system of units. I suspect both the spelling change and resistance to unit changes have far more to do with protectionism than anything. Both isolate the US and stop them from importing books, particularly textbooks. Someone has probably made a lot of money from that.