What key difference between the north and the south ultimately lead to the civil war?

For decades the north and the south fought over several economic issues, “the second great awakening” from the people of the north meaning they started to attend many religious gatherings by the 1820’s wanted to live and better and morally better life thus the abolition movement started(end slavery) other than that the north wanted to bring factories and big cities to the south but the south lived a farming lifestyle and heavily dependent on slaves, which the north abolition movement worried many southerners.

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[tex]< b> hey  /tex]meer quasim: -  he was the ruler of bangal after meer jafar . in the battle of plassey(1757ad.) sirajuddaula died and the east india company made the ruler of bangal to meer jafar and meer quasim was the son in law of mir jafar and became ruler after replacing meer jafar who himself been suported to east india company.he became ruler in 1760a.d. replacing meer jafar and he started to offense east india company so the result came as the battle of baksar ( 1764 a.d.) which was fought between meer quasim and hector munro . and meer quasim died in this battle and after this battle east india company became the ruler of bangal .robert clive : -  robert clive was the founder of britishers in india . he came in india in 1746 a.d. and was selected as commander-in-chief of british india . at that time sirajuddaula was the nawab of bangal and he banned the import from callicuta hence east india company gathered army and the result came through as the battle of plassey . the battle was fought between siraj-ud-daula and robert clive and sirajuddaula lost that battle and died .the main reason was for the defeat of sirajuddaula that meer jafar cheated him.when robert clive came in india he was just the age of 18 years but when he went back in 1772 a.d. his money was 401,102 pounds .  robert clive was sent in india to reduce cruption in east india company but when he went back to england in 1772a.d. he had to give recommendation for himself as he gathered a lots of money . and in 22 november 1774 he died .