The two main kinds of slavery were indentured and chattel.
Indentured slavery first arrived in America in the decade following the settlement of Jamestown by Virginia Company in 1607. The idea of indentured servitude was born of a need for cheap labor. The earliest settlers soon realized that they had lots of land to take care for, but no one to care for it. With passage to the Colonies expensive for all but the wealthy, the Virginia Company developed the system of indentured servitude to attract workers. Indentured servants became vital to the colonial economy.
Chattel Slaves are property and can be traded as such.They have no rights, are expected to perform labor (and sexual favors) at the command of a slave master. This is the form of slavery which was carried out in the Americas as a result of the trans-Atlantic slave trade.
Because his fame protects him from retribution
I believe the answer is theoretical model
A theoretical model is the foundation that could be held to support a certain theory for a certain research or study.
From the example above, the study is build on a foundation that both behavior and environmental factor could affect the subjects' overall health
Self-centered people can be empathic.There's no one reason why people get depressed