Laurentia! 
BTW most of Asia including India and China are geologically speaking recent formed into one continent. China is made up of three geologically seporate pieces which slammed into the rest of Asia just as India is now doing and Japan will be doing in the future. Those pieces "docked" at much slower speed though so they didn't result in massive mountains (though they did creat a number of mountain ranges just as the docking of most of western North America did to the NA plate).
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BTW most of Asia including India and China are geologically speaking recent formed into one continent. China is made up of three geologically seporate pieces which slammed into the rest of Asia just as India is now doing and Japan will be doing in the future. Those pieces "docked" at much slower speed though so they didn't result in massive mountains (though they did creat a number of mountain ranges just as the docking of most of western North America did to the NA plate).
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