What was the relationship between the united states and china at the beginning of the nixon presidency

During the presidency of Richard Nixon, the United States acknowledged the Communist government of the "People's Republic of China". He was the "37th President of United States" and served his country for five years (from "1969 to 1974").  

In 1972, Nixon visited the China to lead the diplomatic relationship between "United States and China". He gave ordered to create Environmental Protection Agency. He is the only president in the American Presidency history who resigned from his post.

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."