Over time, how did the nature of slavery change in america?
a. enslaved persons were mostly american indians.
b. slavery became more permanent for enslaved persons, but not their families.
c. slavery was based entirely on race.
d. slave codes protected enslaved persons from cruel and unusual punishment.

the answer is c @yrnkevo

c. Slavery was based entirely on race.

Explanation:

Slavery had been used by many civilizations way before the discovery of America  by the Europeans. A person could become a slave when his/her city was taken over by another civilization. Most of the male war prisioners turned into cheap workforce for tough activities like mining and building while the female ones turned into servants for more domestic tasks. The same went for America, however there was a diffrence and it was that slavery was race-based. A race Hierarchy was made by conquerors with the Europeans at the top of the structure and indigenous, Africans  and mixed races below them. That concept of European supremacy allow them to slave the other races according to the hierarchy. Africans were the most exploited, followed by indigenous while mixed raced experienced more or less slavery depending on how close they were related to Europeans.  Slavery in America was based entirely on race.

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )