<human>:  When did the Sino-Soviet split happen?
<bot>: The Sino-Soviet split happened in the early 1970s. The Sino-Soviet split was a political conflict between the Communist Party of China and the Communist Party of the Soviet Union. The conflict began in the late 1950s, when the Soviet Union launched a campaign of "de-Stalinization" against the Chinese Communist Party. The conflict was resolved in the late 1970s, when the Soviet Union recognized the People's Republic of China and withdrew its forces from the Chinese mainland.