What was the battle had the most casualties? Battle of Antietam
Fort Donelson
Battle of Shiloh
Fort Henry

Battle Of Shiloh

yellow fever and other tropical diseases

one of the main reasons was definitely slavery. back in 1861, republican abraham lincoln was elected and ended up being a major influence in the slavery business. slavery greatly affected the texas economy because back in 1845 during the annexation of texas, slaves became a big part of the texas population. many texans that were in favor of the secession influenced groups through party ties.