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In page Freedom of movement:

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As a part of the one country, two systems policy proposed by Deng Xiaoping and accepted by the British and Portuguese governments, the special administrative regions (SARs) of Hong Kong and Macau retained separate border control and immigration policies with mainland China.[1] Chinese nationals had to gain permission from the government before travelling to Hong Kong or Macau, but this requirement was officially abolished for each SAR after its respective handover. Since then, restrictions imposed by the SAR governments have been the limiting factor on travel.[citation needed]