What does washington believe must be done if national unity is threatened?

He believes the leader has to re unify it's nation and save it from distress by stepping up his game.

Explanation:

Unity and sectionalism

He begins his warnings to the American people by stressing that their independence, peace at home and abroad, safety, prosperity, and liberty are all dependent upon unity among the states.

First, he warned of the dangers facing the young republic. Second, he highlighted the threat posed by internal factions. Lastly, he suggested the path America should take in its relations with foreign powers.

the correct answer is b