China's growth will stagnate as time goes by, they won't grow at the same pace as they're growing now. As more and more chinese will live better lives they'll be more educated and throw out their communist regime. Plus their cheap labor advantage will disappear while their consumption will skyrocket.
To slow China down one would have to make sure they get less and less access to oil reserves. An invasion of Iran would void some of their key contracts and severely limit their expansion, a reason why China is a major opposing force in the UN when it comes to dealing with Iran.
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