Look at the table of city growth between 1820 and 1860. City 1820 1840 1860 New York 123,786 312,710 813,669 Boston 43,298 93,383 565,529 Philadelphia 62,738 93,665 177,848 Source: Historical Statistics of the United States Which factor was the MAIN reason for the data shown in the table? (1 point) Responses the growth of urbanization throughout the Northeast the growth of urbanization throughout the Northeast the growth of industrialization and the development of factories the growth of industrialization and the development of factories the expansion of plantations and the spread of slavery the expansion of plantations and the spread of slavery the elimination of slavery in the North
