How many more years will it take, before China takes over the U.S.?

China will never be able to challenge America's power at any point in the forseeable future. Our military tech is decades ahead of theirs, our economy far more robust, and our network of alliances far more stable and far-reaching. China has engineered for itself a demographic crisis so serious that it will cripple them for decades and force their entire economic output to turn inwards. Meanwhile, the US is will continue strengthening its demographic structure through immigration and capitalizing on the collective intellectual prowess and ingenuity of the world's best and brightest. Taiwan will remain a free country and America, land of the chads, will remain unchallenged as the dominant power of this Earth.