A whole constellation of mostly rich allies and friends, many of which may be forced to join some hostile power, in the same way that Czechoslovakia was forced by Stalin to abandon the Marshall Plan (1946) and later absorbed into the Soviet Bloc outright (1948).
Aren't you happy to have countries like Italy, Germany and Japan as friends? Was it better or cheaper for an average American taxpayer when they were geopolitical adversaries? I doubt that.