The cities of pittsburgh, cleveland, and chicago all became major industrial centers in the 19th century. which of the following greatly contributed to the growth of these cities?
a. good land for farmingb. a warm climatec. access to major waterwaysd. large population of slaves

The correct option is C

Between the beginning of the decade of 1780, at the end of the War of Independence, and 1914, at the outbreak of the First World War, the United States went from being a country with a small population, distributed over a large territory, to be the nation with the highest per capita income in the world and the leading industrial country, surpassing Great Britain since the late nineteenth century. Between 1896 and 1900, the United States generated 30% of world industrial production, while in that period, Great Britain was responsible for 20%, and Germany, 17%. The new immigration was basically an urban immigration, that is, it was established preferably in expanding cities and in large industrial enclaves such as New York, Chicago, Pittsburgh, Milwaukee, Detroit, etc.

the answer to your question is,

d. when a child was born.

-mabel < 3