In the second half of the 19th century, the u. s. government allowed more immigrants into the country mainly because a) more soldiers were needed in the american military. b) industries needed an increasing amount of cheap labor. c) the world war in europe was causing millions to flee their homelands. d) western territories needed more settlers to explore for gold and silver.

B) industries needed an increasing amount of cheap labor.  

B)industries needed an increasing amount of cheap labor.

Because industries needed an increasing amount of cheap labor, more immigrants were allowed in the late 19th century America. Most came from central, southern, and eastern Europe, settling in big cities which were home to growing numbers of factories.

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the process is called revolution because it was a process of great economic-social transformations that began in england in the xviii century.

the industrial mode of production spread throughout much of the northern hemisphere throughout the xix and early xx centuries.

the effect of this revolution was the distance between the countries, with respect to economic and political power.   after all, not all industrialized at the same time, remaining in the condition of suppliers of raw materials and agricultural products to the industrialized countries.

these differences mark to this day the nations of the world that are divided between developed and developing countries. one way to measure whether a country is advanced is to assess how industrialized it is.