The American System was an economic plan proposed by Henry Clay in the early 19th century. It aimed to promote national economic growth through a combination of protective tariffs, a national bank, and internal improvements like roads and canals. The goal was to create a self-sufficient economy and strengthen the ties between different regions of the United States. The plan sought to protect American industries from foreign competition by imposing tariffs on imported goods. Additionally, the establishment of a national bank would help stabilize the currency and provide credit. Overall, the American System aimed to enhance the nation's infrastructure and promote economic unity.