Half true. Correct version: the civil war was fought to prevent the south, as a large scale ‘pre-industrial’ agrarian plantation export economy reliant on slave labor common among overseas empires from dominating the federal government under westward expansion, thus changing the locus of economic and political power from the newly industrial northeast domestic economy and it’s low volume small farms operating by families. The south would have controlled the continent by agriculture instead of the north by industry, only amplifying the slave problem. Ergo it was better to stop the spread of southern power before it was large enough to defeat northern power. Unfortunately, despite the possibility, (a) the north could have and should have paid the south for the repatriation of slaves back to africa (b) especially when slavery was rendered pointless by industrialization within 30 years. In other words it was a foolish loss of millions of people. The civil rights era was equally foolish as the black population made more progress prior to the era than after, and the policies of the era destroyed the black family, caused ‘the slaughter of the cities’ (look it up) and collapsed the emerging black upper middle and upper classes who defected and joined the ‘white’ classes.