Why?
I'll use the example of money.
How come Canadians have a 1 and 2 dollar coin and whenever the US tries something it fails? The US never just says "on this date, the paper bill is no more and you'll be using coins now, tough love."
Yeah strange bedfellows, but not really, if it wasn't for those countries, the US would be out of business as the world cop. Although we've basically been replaced by the WTO now. They effectively do what the US did back 'in the day' in offing democratic leaders etc. But we devised something better in the WTO, they get to control countries without having to kill anybody.