AS OF 2019
The US is divided, and polarized, in so many ways now. The most powerful division is the rural/urban divide. Every state looks the same now -- blue in the urban/suburban areas and red in the rural areas. Voters are concentrated in the urban areas.
But there are many others divisions. Age divides. Religious divides. Race divides. Gender divides. College divides.
In 2019, Republicans would be most unhappy if their child married a transgender person. Democrats would be most unhappy if their child married a Republican.
There are many great articles about how Republicans and Democrats are at odds now and also how much common ground there might be.