The Soviet Union had withdrawn from Afghanistan, and was in internal collapse from 1989 to 1991, when it formally dissolved. The implementation of democratic order, fall of the Berlin Wall, release of former Soviet bloc countries, and access to trade and resources (American multinational corporations assisted with oil field expansion, food, capital, etc.) met most of the goals the US would have hoped to achieve through military action.
Remember, a McDonald's was build in Moscow? The lines wrapped around the building and extended for blocks.
The Cold War was won.
A Hot War, in the 1970-1985 range, per Jane's, would have been won by the United States. However, the damage to US infrastructure, populations, and refining capacity would have ended US industrial leadership, and made the US a target for other opportunistic industrial nations, in the decades after the war. I believe this scenario involved a gradual escalation. The other options were for the US to successfully strike first, or to unsuccessfully strike first.
The targeting for both sides ended up even assigning strikes to population centers of 25,000 or more, if the US first strike was detected and a Soviet response launched.
So, in one case, the US wins, 110,000,000 casualties on our side (assuming we struck first and successfully, and that is a very, very optimistic figure), and we would, in that scenario, have to halt private gasoline sales, ration food, etc. for an occupation force overseas.
If the Soviets avoided the first strike by launching their own, so both the US and Soviets delivered about half of their warheads each, in the aftermath, the US and the world decline into a famine (the US/Canada was the leading food exporter at that time, and the US missile fields located there would have placed those in the fallout belts from Soviet counter-strikes). It would also turn into a long nuclear war, as weapons would be recovered from unused or surviving locations on both sides, and delivered, as the fighting intensified and the command and control structures broke down on each side.
Civil disorder would require martial law, and the end to all democratic function.
Depression, economic collapse, and a grim, dark, deadly time not seen by humanity since 410 AD in Europe, when half to a third of the population died in the Dark Ages, might have been the next century's birthright, including ecological damage that would reduce the planet's carrying capacity for a century or more.
Whew, that was close!
Thankfully, smart people looked into this before we did, and used political and economic means other than warfare to effect a change.
Sherman didn't make up the expression "War is hell", he knew it. It is hell on earth, even when you are right, or wrong, or just a bystander. Ask a veteran.