Rash in Parshas Noach, mishom hefitzom differentiates between dor hamabul and dor hafloga. Dor hamabul was destroyed because of lack of unity but by dor hafloga the unity protected them and they got punished by breaking up the unity. The Sifri says from Ephraim (Hoshea 4,17) that peace protects even from a’z. If there is no unity in a shul, Hashem escapes from there as I and him cannot reside in a one place.
As soon as klal yisroel united as one loving nation together on all levels from frum to frei to chassidish etc and does serious teshuva and achdus together then Mashiach will come.
What I believe he is trying to say is that the country is about 50-50 Democrat vs Republican and the party that stays united and get other legislators to agree will be able to pass legislation and govern.
Or he could mean that we are close to a civil war and unless we are united the United States will cease to exist as a country.