What new social/economic class of people formed during the second industrial revolution in the us?

During the Second Industrial Revolution in the United States, the Treaty of Guadalupe-Hidalgo in 1848 was formed. It is the unprecedented urbanization and rapid territorial expansion.  It is secured Mexican cession of the Southwest to the United States. This expansion competes the visions free-soilers, immigrants from Europe, and Industrial capitalists.

the us constitution is a living document, meaning that it can be changed over time as the country changes.

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