First of all, the decline of Britain is the decline of economy. Britain did take the lead in becoming a powerful country through the industrial revolution and led the technological revolution at that time. However, with the continuous expansion of the colonies, the British found that they could get better profits by exporting capital and exploiting the colonies, so a large amount of capital flowed to the colonies, which slowed down the local technological innovation, gradually hollowed out the local industries and relied heavily on the colonies for economy. In World War II, because of the war, Britain spent a lot of money to buy munitions, and its home country was bombed by Germany, and its economy suffered heavy losses. Finance is on the verge of collapse. After the war, it could have helped the local economy by plundering the colonies, but due to the influence of World War II, the control over the colonies was greatly reduced, the colonial national liberation movement flourished and became independent one after another, and the decline of the British economy was inevitable. Even India was lost, and the queen became the queen. Secondly, the rise of the United States after the war replaced Britain's global hegemony, especially the dollar replaced the pound, and Britain's position in the global economy decreased. Third, the economic downturn has greatly reduced Britain's pivotal position and influence in international affairs.