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Wiktionary
one country, two systems

n. slogan for the reunification of China as one country, but with areas like Hong Kong and Taiwan with separate economic and political systems.

Wikipedia
One country, two systems

"One country, two systems" is a constitutional principle formulated by Deng Xiaoping, the Paramount Leader of the People's Republic of China (PRC), for the reunification of China during the early 1980s. He suggested that there would be only one China, but distinct Chinese regions such as Hong Kong and Macau could retain their own capitalist economic and political systems, while the rest of China uses the socialist system. Under the principle, each of the three regions could continue to have its own political system, legal, economic and financial affairs, including external relations with foreign countries. Taiwan could continue to maintain its own military force.