Why is it worse? Cuz they made you watch Amistad in school?

Slaves were rarely treated as poorly or had such terrible lives as those shipped from Africa to the Caribbean and southern north American colonies.

Says who? If anything it was only because of the industrialization of the time, by coincidence. The average person also had probably the worst of lives during the industrial revolution. Three year olds worked in mines and cleaned chimneys for half pennies. Legally free railroad workers were exploded by the thousand. The average soldier was getting mowed down by rapid fire guns and long range rifles.

You literally believe that being a slave in the year 300BC was better off than being a 19th century slave?

beyond anything anyone had ever seen

You think the hundreds of thousands of christians abducted by muslims were treated well? It was convert of die, or ransom. The women were forced into harems.

They used to throw babies into Brazen bulls with their moms watching, they used to cut living peoples hearts out while alive and throw their heads down pyramid steps. They used to crucify women because their family member ran away. Sorry for the tirade but holy shit take your hyperboles and shove them up your ass. Learn some history.