What was the main result of the socio-economic and political development of the United States

What was the main result of the socio-economic and political development of the United States by the end of the 19th century?

The 19th century in the United States was very successful in terms of socio-economic development. Population growth was rapid due to high natural growth and external migration from European countries. By the end of the century, migrants from China appeared in the United States.

By the beginning of the 20th century, the United States took the first position among all countries in the world in terms of industrial production and overtook the old leader – the British Empire. The country had developed agriculture, shipbuilding, mechanical engineering and the longest railway network in the world, which connected the coast of the Pacific and Atlantic oceans.

In the political sphere, the result of development was the approval of a federal republic in the United States, where the post of president was held by a native of two parties – a Democrat or a Republican.