Because the islands they are building are in a position in the East China sea that will allow China to control and choke off the narrow shipping lanes that connect the Western and Eastern hemispheres. They have HUGE international implications for all of our allies in the region. China is effectively creating a situation akin to having a Panama Canal that all of it's neighbors have to go through to ship their goods.
China is effectively creating a situation akin to having a Panama Canal that all of it’s neighbors have to go through to ship their goods.
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You KNOW it already has that?