Us = the world/humanity, not the USA. China's economic growth has lifted hundreds of millions from poverty, and it would not have happened without globalization.
Lifted millions out of poverty at the expense of millions of middle class American jobs. I believe globalization largely did not end up in the best interest of most Americans because the transfer of technology and manufacturing did not result in a new American ally, but rather a strategic competitor. For over a decade now we've seen a rift in the interests of the common people and the elites in the United States, which is why we've seen the resurgence of populism.
>China's economic growth has lifted hundreds of millions from poverty
Starting from the point of the great leap forward, yes there has been an improvement.