Based on disputes over the sovereignty of the Falkland Islands, this paper analyzes the problems of transfer of sovereignty of a colony and related wars in the post-colonial era. The dispute of the sovereignty transfer of the Falkland Islands has caused the Falklands War and further leads to the British government's change of colonial policy in the post-imperial era. The dispute over the sovereignty of the Falkland Islands demonstrates the conflict between international realism and a nation's interests. The Falklands War could be regarded as a controversial campaign of imperialism during the end of the Cold War. This paper concludes with comments and evaluation of this practice of the transfer of sovereignty of a colony.