France, Spain and UK under a personal union

What would happen if the three are under a personal union the POD is either during Renaissance or the industrial revolution.
 
A lot could happen, most likely they would be considered the worlds most powerful nation(s) and in jealousy a bunch of smaller/weaker nations would likely form a coalition against UK Spain and France and if a war broke out and things got hairy enough I figure that Russia would probably want in on the cake and join the coalition against UK Spain and France... Cause considering how people were back then Everyone wanted the cake that was named the New World (even if the cake is a lie) and the major obstacles in the path to that cake are those three nations... But maybe I'm thinking too far ahead...
 
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