China and the U.S. are unlikely to ever be able to invade each other. The logistics involved supported an army thousands of miles from home is incredible. I doubt either country could gain such a vast advantage over the other to make some sort of an Invasion possible.
The U.S. is the by far the hardest country to invade on the planet. We have a large population, a huge industrial base, and no powerful (or hostile) land connected neighbors. I doubt we will ever even face the possibility of invasion in my lifetime.
And all of this is assuming that China somehow figures out of way to negate our world-obliterating nuclear arsenal.
EMP high altitude attacks are pretty nasty if you want to take out critical infrastructures and communications.
2008 EMP Threat assessment
Maybe I am just vindictive but I would much rather my tax money go into special weapons research than the bankers pockets.
This guy invented the neutron bomb
Bomb inventor says U.S. defenses suffer because of politics
"Other nation's haven't been afflicted by the U.S. blindness regarding neutron bombs. According to Cohen:
Evidence exists that China has neutron bombs stockpiled, and that the United States gave the Chinese the technology to build them.
Russia has a large quantity of such weapons, as well as the world's largest arsenal of nuclear weapons.
Israel has hundreds of neutron weapons. The neutron bombs would allow Israel to stop advancing Arab armies and tank columns - even one on Israeli soil - without permanently contaminating the land.
South Africa, which constructed a cache of neutron weapons before the end of white rule, claimed it dismantled those weapons before handing over power to the Nelson Mandela government. Cohen, however, claims to have it on good authority that white military leaders still control the secret stockpile as "an insurance policy."
Most frightening for Cohen is the relative ease by which neutron bombs can be created with a substance called red mercury. Red mercury is a compound containing mercury that has undergone massive irradiation. When exploded, it creates tremendous heat and pressure - the same type needed to trigger a fusion device such as a mini-neutron bomb.
Before, an obstacle to creating a nuclear bomb was the need for plutonium, which when exploded could create a fusion reaction in hydrogen atoms. But red mercury has changed that. The cheap substance has been produced in Russia, Cohen said, and shipped on the black market throughout the world.
Cohen said that when U.N. inspectors went to Iraq to examine the Iraqis' nuclear weapons capabilities, the U.N. team found documents showing that they had purchased quantities of red mercury. The material means a neutron bomb can be built "the size of baseball" but able to kill everyone within several square blocks."
In a few more years China won't have to invade us, they'll own us!
America will be the world's first tri-lingual country - English, Spanish, and Mandarin will be the official languages...
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Thus, your weapon idea is self defeating. Also, that's one of the (many) reasons why neutron bombs never were feasibly built.
"If your opponent is of choleric temperament, seek to irritate him." - Sun Tzu