One important difference between the economic systems of the north and the south in the period 1790-1840 was Industrialization and Immigration. Basically, the slave economy of the south supported agriculture, while the free society in the North facilitated industrialization. ( hope that helped have a good day )
Answer:
C. Corrupt colonial representatives in Parliament
Explanation:
From the 1760s public opinion of the thirteen colonies became aware of their identity and unity of interests in a growing opposition against the British government, which did not heed appeals for moderation; until the dynamic of mutual challenges led to an armed conflict, the War of Independence (1775-1783, although decisive victories on the battlefield occurred in October 1781).

Now,
Since the "x" and the "4" have the same exponent and they equal eachother,
x = 4
Labor unions were needed for workers rights