Many Chinese mainlanders still believe Mao Zedong was a great leader, but they also knew that he did unwise and bad things. According to Deng Xiaoping, Mao was "seven parts right and three parts wrong" and his "contributions are primary and his mistakes secondary." Supporters praise him for having unified China and for ending the previous decades of civil war. He is also praised for having improved the status of women in China and for improving literacy and education. Some people think Mao Zedong made China lose its most important ally, or friend, the Soviet Union, in the Sino-Soviet Split. The Great Leap Forward and the Cultural Revolution were two of the things that Mao did that many people disliked. Some historians think that tens of millions of people died because of Mao's bad ideas and neglect. Some people disliked Mao because he did not express support family planning, and this caused too many births, making too rapid population growth in too small places. Leaders of China after Mao had to pass a new law called the one child policy.