Answer: non-involvement in European affairs
Step-by-step explanation:
George Washington was a devout advocate of non-involvement in the affairs of other countries especially European powers.
This is why even though the French monarchy supported the Americans in gaining independence from the British, when they were overthrown in the French Revolution, the Americans under Washington did not get involved.
Washington thought it best to stay away from long term engagements with other nations and to maintain neutrality such that the best policy can be objectively followed.