@Caty
U are making a mistake by grouping China with Iraq n Afghanistan, both didn't have enough defense or anything to put a decent fight against US, but it's different with China. With that, the cost for war with China will increase a lot, it can be 10x 20x or more.
As a matter of facts, Iraq is a peer and near peer enemy of the United States.
Before both Iraq war (the first gulf war) and Operation Iraqi freedom. Pundit and military advisor alike would see American and NATO coalition would bleed more than they actually did after the actual invasion.
In the first gulf war, US and NATO coalition amass a 900,000 troop force in Iraq, facing the Iraqi "2 millions" army, but actually more than half of those are conscript.
However, not all 900,000 NATO/UN Coalition troop are "In theater" all at the same time during the invasion phase. In fact, Saudi Border with Kuwait and Iraq only did allow 300,000 some troop to stage an offensive there as the border itself is a battlefield between Iraq and SA.
Facing at least 600,000 Iraqi elite troop (medina division and other republican guard) It's not 300,000 UN troop strength nor technological advantage that broke thru the Iraqi Border and Swing around to liberate Kuwait, but rather the overall tactics of both side. The clever deployment and feign attack from the US/NATO and the fail tactics on Iraqi side.
In 2003 invasion of Iraq, the situation is even worse than it was in 1991, while the Iraqi force largely remain unchanged still the same division and numbered 500,000, simply because US and NATO did not destroy much of Iraqi military infrastructure and even less troop destruction during desert storm, but this time US can only afford a 170,000 force instead of 500,000 in Desert storm and overall NATO force not more than 300,000 troop. Yet the enemy is the same medina division and republican guard of 500,000. However this time tommy frank once again feigned and fake the Iraqi Army.
See, the Iraqi army this time would think the American is going to start a length air campaign, like they did with a 4 months bombing in 1991, instead of having their troop ready on the battle line and hold position, they were ordered to dig in and wait for the NATO bombing that has never came. Instead, Tommy Frank ordered a Blitz attack to capture Baghdad, 300 mile away from the US Starting point in Kuwait. The result is when the American 3rd division arrive in Baghdad international airport, the Iraqi force was in their underground bunker sleeping. Only when they wake up, which is the following day, the Battle of Baghdad was commenced.
Iraq is not a push over as many think, in fact, if Iraqi command is better at preparing for war instead of talking about it on radio and TV, they would have done better than what they actually did
But all that aside, this does not change the argument anyway. As indeed you cannot compare Iraq and Afghanistan to China. but you also cannot compare US Force to those of Iraqi and Afghani rebel. It may have been 10 or 20 times the cost, but it goes both way, the different again is, US will not be paying those 100 to 200 trillions alone (If you say 10 to 20 times) but China would have to fork them out of their own pocket, so....Even if I give you that, the argument stays the same. A war in this scale, China alone cannot pay for it.......Plus a war this scale if happened around Chinese coast, while Chinese cannot touch American Mainland Infrastructure, but every city and every Military target in China would have been open to attack, in exchange, China may or may not get some far away target in Guam, Japan or even Australia. Which largely have nothing to do with US economy, which mean they can bounce back almost immediately.
How much is the CIA paying you?
If I say something you don't like then CIA is pay me, then I guess they are rich enough to pay for more than half of the world, I would say about 60-70%. There how US influence goes.