If China invades Taiwan, USA likely will NOT get involved (other than some baseless threats and arming Taiwan). USA cares about Taiwan as much as they care about Greenland, which is to say not much. For instance, consider the US rhetoric that it will use nuclear weapons if China invades Taiwan. How many people actually believe that? Not many--at least those in power and with knowledge. USA will never sacrifice itself (by using nukes) for some foreigners it could care less about. The only time it will use WMD is if it (i.e. its own citizens) are attacked. It will never use it when other people are involved (whether it is Taiwanese, Israeli, Canadian, etc).
If Canada is attacked withh WMDs i think that the US would get involved as most populated canadian cities are near the US-Canadian boarder, the fallout alone would kill alot of americians
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If Canada is attacked withh WMDs i think that the US would get involved as most populated canadian cities are near the US-Canadian boarder, the fallout alone would kill alot of americians