In what year did the united states play ping pong against china?

Answer 1

You're probably thinking about the events which took place in 1971.

Several countries were invited to China to play some friendly Table Tennis matches and it became known as Ping Pong Diplomacy.

At that time, China's contact with the outside world was limited ... and relations between China and the USA in particular were very tense.

These matches helped to improve relations between China and USA.