Uni-party System
A uni-party system is a political system in which only one political party is legally allowed to exist and hold power. This means that the ruling party has a monopoly on political power and control, while other parties are either banned or heavily restricted. This system is often associated with authoritarian or totalitarian regimes, where the ruling party suppresses opposition and dissent.

Countries with Uni-party Systems
The countries that have a uni-party system include:

China
- The Communist Party of China (CPC) is the ruling and only legal political party in China.
- The CPC has maintained its dominance since the establishment of the People's Republic of China in 1949.
- The party controls all aspects of political, social, and economic life in China, and dissent or opposition is not tolerated.

North Korea
- The Workers' Party of Korea (WPK) is the ruling and only legal political party in North Korea.
- The WPK has absolute control over the government, military, and economy in North Korea.
- The party is led by the Kim dynasty, and the country operates under a highly repressive regime with limited freedoms and severe human rights abuses.

Cuba
- The Communist Party of Cuba (PCC) is the ruling and only legal political party in Cuba.
- The PCC has been in power since the Cuban Revolution in 1959 led by Fidel Castro.
- The party controls all aspects of political, social, and economic life in Cuba, and opposition to the party is not allowed.

Conclusion
In conclusion, China, North Korea, and Cuba all have uni-party systems where only one political party is legally allowed to exist and hold power. These countries have highly centralized and authoritarian regimes, with the ruling parties exerting absolute control over all aspects of governance. Opposition and dissent are suppressed, and political freedoms are severely limited.