The West has been destroying itself lately, imagine if the Soviets could take advantage of it
You shouldn’t worry about US balkanization as a real possibility. The US even with its cultural divisions is still one of the most unified countries on the planet (it’s probably one of the least likely countries in the American continent), especially among the bigger ones to balkanize Canada and Mexico are certainly more likely to balkanize first. It’s also an order of magnitude more likely that you’d see balkanization of India, China, Pakistan or something first (other nuclear powers are similarly unified in the current year to a comparable degree as the US).
The biggest cause of balkanization is linguistic divisions, especially when their combined with other things like religious or broader ethnic division, and preexisting strong levels of local autonomy that tend to exist in a lot of other countries far more than they do in the US, especially as it relates to cultural education and development.