b. Briefly explain ONE specific historical effect of the changes in United States energy sources between 1850 and 1900.A better energy source led to more factories which helped provide more job opportunitiesfor incoming immigrants. Immigrants then moved to the cities where these factories werelocated, causing a massive rise in the urban population. Urbanization became popular with the rise of factories and immigration because of the new energy sources. c.Briefly explain a SECOND specific historical effect of the changes in United States