Look at the table of city growth between 1820 and 1860.

City in 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

Which factor was the MAIN reason for the data shown in the table?
A. the elimination of slavery in the North
B. the growth of industrialization and the development of factories
C. the expansion of plantations and the spread of slavery
D. the escalation of urbanization throughout the Northeast

2 answers

I would say b.

I would say D