Which sector of the american economy grew the most between 1820 and 1860?

After independence, the thirteen states of the United States had to find a way to sustain themselves economically, they began the construction of railroads, this led to the production of consumer goods, being cotton their main sourse, they begin the manufacture of textiles, opening a big window to the construction of machinery for the manufacture of textiles, welcoming to mechanical industry era, where it started manufacturing another type of machinery necessary for other items.