Final answer:
The conflict perspective asserts that white dominance over Black people in the first half of the 20th century was achieved through both Jim Crow laws and violence perpetrated by ordinary citizens.
Step-by-step explanation:
The sociological perspective that asserts that white dominance over Black people in the first half of the 20th century was achieved through both Jim Crow laws and violence perpetrated by ordinary citizens is the conflict perspective.
Learn more about White dominance and Jim Crow laws