Those from the North generally opposed slavery in Kansas. Election fraud, intimidation, and some violence resulted, when the two sides began to contest the territory. The turmoil in Kansas contributed to the growing tension between the North and the South, which eventually led to the outbreak of the Civil War.
In 1864, Johnson was a logical choice as running mate for Lincoln, who wished to send a message of national unity in his re-election campaign; and became Vice President after a victorious election in 1864.