When Lincoln died, the nation was thrown into trying to rebuild from the civil war, multiple slavery sympathizers got government positions so they introduced new stuff that was like slavery but not directly linked to it. Some of those systems still stand today, it’s sad. GOD BLESS AMERICA
The second group of southern states seceded after the attack at Fort Sumter. Four additional states left at this time. These states left because they had concerns about what would happen to slavery now that the fighting had begun. They waited until the Civil War began before leaving the Union.’!!!!!!!!!!
Secondary sources is the right one
The Three Main Effects of European Imperialism. Due to European Imperialism and many countries arguing over the land they each wanted, tensions were formed between them. Following this, many countries sought alliances between each other to feel secure. This played a big role in the outbreak of the war for many reasons.