Let's clarify one thing, Troop numbers mean nothing in these times other than having the minimal amount. The last time troop numbers meant anything was the Korean conflict where China sent hundreds of thousands across the boarder to die. Without those numbers the North would have surely been defeated and United Korea would exist today. This is not like the early 1900, ww1 or ww2 for that matter, just look at the Soviet invasion of Afghanistan the Mujahideen had over 250,000 ground troop to 650,000 Soviet troops and troop strengths had no consequence on the outcome. It is a new day of war and the amount of troops you can muster no longer dictates your strength or guarantee of winning. Today the strongest asset is controlling the sea's and no Country currently on earth can come close to comparing with the US technologically with our Naval force.

True China has large land mass, 40% uninhabitable but still large. True also they have a very large population but your figure of drafting 350,000,000 is way off, you must not include: elderly, disabled, sick, children, most women. This greatly reduces your number. The US has over the last two decades focused on 5/1 principle, that is our technology of war machines of all kinds can equate to 1 Stealth Bomber equal damage 100k troops could employ, Air superiority would be won by the US within one month. Once we controlled the sky we bomb the population down by half within 4 months, and if we wanted to we could just continue this until China gave up or lost all of it's population. No need for ground fighting in this type of war; as we would not want the territory Just the end of the governing body. China has been hyped over the last decade and is no where near the hype that is bestowed upon them. We could crush their Naval forces within 6 months, and the Air forces within 1-2 months, with Air and Sea superiority they are left with just being bombing targets unable to stop the non-relenting bombing of US forces from the air and sea. All of China's war machines are supped up Soviet era equipment, they do have a few newly Made in China war machines but 1 generation compared to the US 7 generation...It no match. And as far as flying deep into China Territory truth be know we do it now what makes you think we could not then? Stealth my friend and nobody is even close to our technical advantage in that arena.

I support your statement, the only thing I would possibly consider would be it very well may be Japan instead of Taiwan that would get us into that war. Other than that I think you are spot on, there is not a Country I can think of that could defeat the USA in a land invasion of US soil, there are just to many armed citizens it would be akin to a 150 million man militia, that is all together separate from the US military and reserve units. The only way the USA goes down is by Nuclear destruction which is really mutual destruction and likely the end of the World. We should be very thankful and vigilant over our 2nd amendment it was a great idea in forming the Nation that should be protected at all cost.

The British and Russians that did the bombing? The very first ever daylight bombing raid on Berlin was done by the US Eighth Air Force with devastating effect. The B2 was the crown jewel in Air to ground bombing. March 6, 1944, The US Eigth sent over 700 heavy bombers along with 800 escort fighters to hit numerous targets within Berlin, dropping the first American bombs on the capital of the Third Reich. Again on the 8th of March, another bombing raid of the Eighth sent 600 bombers and 200 fighters to employ total destruction on Berlin again.Then on the 9th of March, H2X radar-equipped B-17s mounted a third attack on Berlin through heavy clouds. Altogether, the Eighth Air Force dropped over 4,800 tons of high explosive on Berlin during the first week of March. This is just a review of Three days of US bombing of Berlin but enough I think to dispute your statement that The Soviet Union and the RAF did the Berlin Bombing.