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-He warned the nation of entanglements or attachments with other nations.

-He advised against political parties/factions that he believed would tear the nation apart.

-He advised American citizens to see themselves as a cohesive unit (a Union).

Explanation:

-France and Britain had been meddling in U.S. politics, so Washington was naturally frustrated and therefore told the people to rely on temporary alliances for emergencies rather than permanent ones. He wanted to protect the fragile state of the young republic, and in order to do that, he had to steer the country away from war with England and France (specifically the French Revolution, which the US potentially could have entered)

-Washington believed that political factions may seek to prevent the government from effectively executing laws and therefore from enacting their powers provided to them by the Constitution.

-This is related to the other two, but Washington knew that the nation was small and fragile, so he wanted to avoid political sectionalism and strongly promoted the people of the US acting as one unit rather than separate states. This is in relation to his party, the Federalist party, which believed in the power of the federal government.