“The business of America is business!” —President Calvin Coolidge, 1925
Bottom line, US corporations profit more by cheaper manufacturing costs and larger markets to sell their wares. It starts there. When China's Chairman Mao Tse Tung died, US corporations and the US government saw that those who would replace him were interested in changing from an ideology-driven nation to one wealthier and more influential, and with happier citizenry with improved lifestyles — including plentiful and better quality consumer goods.
A half-century ago China had 800,000,000 reasons Big Business lusted after them. The political aspect of globalism is a combination of chamber of commerce marketing (including convincing millions of workers that would be out of jobs that it's a good thing — why, it's globalism!) and Leftist politicians dream of one Big Brother government dictating how all humans should live.