Increased immigration to the U.S. in the early 1800s caused industry to grow because of steady supply of labor.
In the early 1800s, millions of immigrants came from:
As a result, these were both skilled and unskilled labor and it led to rapid industrialization because the skilled labor improved process and the unskilled labor drove the processes that were implemented.
The immigrants mostly settled in the North which was the reason the Union was so much more industrialized than the Confederacy.
In conclusion, the immigration that came in the early 1800s led to urban and industrial growth in the U.S.
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