Slavery ended when President Abraham Lincoln delivered his iconic Emancipation Proclamation. This would eventually free black people so they could become ordinary citizens and NOT slaves. So basically, slavery was ended all thanks to good ol' Lincoln :)
Feudalism was a combination of legal and military customs in Medieval Europe and Medieval Japan. It was a system of structuring society around relationships which were based on the holding of land in exchange of labor and service. This encompasses the wider society. A peasant was protected by his lord who would give him housing and security and the peasant would work on the lord's land. This is a typical example or characteristic of feudalism.