<human>:  How did the United States become such an economic superpower?
<bot>: The United States became an economic superpower through years of growth and innovation. After establishing its independence in 1776, the United States rapidly developed a modern economy based on entrepreneurialism, investment in infrastructure, and federal government initiatives such as the Homestead Act and the Marshall Plan. These initiatives, as well as the country's commitment to open markets and free trade, created an environment of economic stability, allowing the United States to become one of the world’s leading economies.