Donald Trump and the president of Taiwan talked on the phone this month. Jimmy Carter sold out the US (again) by pledging to China that he would not talk to the president of Taiwan. We have a treaty with free China, Taiwan, but are not supposed to talk with them at high levels. Why? See Trump calls president of Taiwan to find out the reasons.
Much of the manufacturing operations of the United States and Western Europe have gone to China since 1979. See the link above to find out some of the reasons. The US has lost millions of decent and good-paying jobs to China during the last 35 years. Both major political parties have agreed to the loss of these millions of jobs. Trump has promised to stop this tragedy.