Improvements in safety and commercial flights were introduced
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The expansion of the American steel industry and railroads during the civil war was made possible by Andrew Carnegie. Mr. Carnegie was a Scottish American industrialists who is known for leading the steel industry expansion.
Industry and trade grew rapidly, in the northwest, during the 19th century, due to the large population of immigrants. The convenient trade routes to Europe also contributed.
the textile industry
By providing land grants for building tracks.