Who led the communists in China?

The massive military retreat of Communist forces lasted a year and covered what Mao estimated as 12,500 km (25,000 Li); it became known as the Long March. The Long March was a military retreat taken on by the Communist Party of China, led by Mao Zedong to evade the pursuit or attack of the Kuomintang army.

Explanation:

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.