A semi-colonial state is a nation that retains some degree of sovereignty but is heavily influenced or controlled by foreign powers, often resulting in a compromised political and economic system. This status typically arises when a country is forced to sign unequal treaties, leading to foreign intervention in domestic affairs, economic exploitation, and social unrest. In the context of historical China, the emergence of semi-colonial status during the 19th century marked a significant shift in national sovereignty and identity.