Both sides have threatened to impose tariffs, raising fears of a trade war between the world’s two largest economies.
The meeting, scheduled for next month in Singapore, was expected to focus on North Korea's nuclear program.
Liu Xia told a friend that she may “die in my home.” She has been under house arrest since her husband, dissident Liu Xiaobo, won the Nobel Peace Prize in 2010. He died in Chinese custody in July 2017.
But analysts say questions remain about the prospects for peace.