New cold war?

I didn't say political party, I said political opposition. By the 70s, many people had become very opposed to the war, and hence the US pulled all the troops out before it was won and left Vietnam to the Viet Cong and their allies.

The reason the US doesn't invade countries like China and Russia is because it would be a great expense and would not be in its own interests. But if the situation arose, the US would certainly win a war against those two countries today. It would be massive and bloody though, like the second world war - a real war between great powers.

If you ignore nukes then the US would be waving the flag over what remained of Moscow within 3 months, the Russian military is actually quite poor in the air and at sea. China again would have no real hope at air and sea but the sheer number of tanks and troops ect.. would be sufficient to prevent any occupation.