Chinese leader Mao Zedong proposed sending 10 million Chinese women to the United States, in talks with top envoy Henry Kissinger in 1973, according to documents released Tuesday.

The powerful chairman of the Chinese Communist Party said he believed such emigration could kickstart bilateral trade but could also "harm" the United States with a population explosion similar to China, according to documents released Tuesday by the State Department on US-China ties between 1973 to 1976.

In a long conversation that stretched way past midnight at Mao's residence on February 17, 1973, the cigar-chomping Chinese leader referred to the dismal trade between the two countries, saying China was a "very poor country" and "what we have in excess is women."

He first suggested sending "thousands" of women but as an afterthought proposed "10 million," drawing laughter at the meeting, also attended by Chinese premier Zhou Enlai.

Kissinger, who was President Richard Nixon's national security advisor at that time, told Mao that the United States had no "quotas" or "tariffs" for Chinese women, drawing more laughter.