From the 1970s of 18 to after World War II, how did the United States get rid of the colonial shackles and gradually develop into the most powerful country in the world?

After the war of independence, the United States was very anxious. At this time, the United States introduced advanced technology, developed industry and implemented a relatively free immigration policy. According to statistics, by the time the Second World War broke out, the population of the United States was nearly 654.38 billion, while when the War of Independence broke out, the population of the United States was only 3 million-this was before the Second World War. After World War II, the United States developed industry, helped western European countries, sent troops to western Europe, and established military bases around the world. Here, I will focus on Asia. In the western Pacific (that is, our South China Sea side), the US military has three famous bases-Okinawa in front, Guam in the middle and Hawaii in the rear. These three islands constitute the largest military force of the United States in Asia, which can seize the Soviet Union and Japan from the top and Southeast Asia from the bottom. Finally, the United States took the lead in launching the third scientific and technological revolution and gave them advanced technology.