They provide "common defense" in the government
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Upton Sinclair's novel, The Jungle, was written to show the world how cruelly and harshly immigrants in industrialized cities were treated in the early twentieth century. At first, the claims that Sinclair made in his novel were thought to be outlandish and over exaggerated. However, when government officials actually looked into the claims, they found that conditions were even worse than what Sinclair had said. Hope this helps.
The framers of the Constitution prevented tyranny separating the powers of the government, creating the system known as check and balances, where each power excercises control of the other two. All this avoids the concentration of power.
Las primeras áreas industriales aparecieron en Gran Bretaña a finales del siglo XVIII, extendiéndose a Bélgica y Francia a principios del siglo XIX y a Alemania y a Estados Unidos a mediados de siglo, a Japón a partir de 1868 y a Rusia, Italia y España a finales de siglo.