It was a Civil War. Civil Wars are not infrequent around the world. There were alternatives to forced resettlement of former slaves to Liberia and that is called education and jobs. The US has taken in uncountable numbers of uneducated people into the US and many of them thrived.The pro union mistake is calling it a civil war it was not. The pro confederate mistake is denying the critical role of slavery as a cause for the war. The abolitionists opposed the resettlement of freed slaves in Liberia which was the only viable option for the southern states if the uneducated slaves were freed. Current historians don't want to hold the abolitionists to account for triggering a war.