If we see the graph of GDP of the last century, the USA has contributed to it the most. There are many geopolitical reasons for their superiority on the chart. The USA has never been into a direct war that cost him a tremendous amount of money and resources. During World War 1, the president of the United States of America, Woodrow Wilson, decided that they should remain neutral. He even started an organization, namely The League of Nations, to bring peace among nations. Despite these geopolitical reasons, America gained power because it has always invited and attracted the best talent in the world. There are many examples, like Albert Einstein and Elon Musk, that originally belonged to other countries, but due to high opportunities in the US, they migrated there. So just like this, there are multiple reasons why America is the most powerful country.