What would be the consequences géopolitics for the United States , if one powers became dominant in Europe?

What would be the geopolitical consequences if NATO were to disappear? And what would happen to the United States if it were "excluded" from Europe, or if a power dominated the continent?
What would be the consequences géopolitics for the United States , if one powers became dominant in Europe?
What would be the consequences géopolitics for the United States , if one powers became dominant in Europe?
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