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Discriminatory intent and disparate impact

Because inequalities can be caused either intentionally or unintentionally, the Supreme Court has decided that the Equal Protection Clause itself does not forbid governmental policies that unintentionally lead to racial disparities, though Congress may have some power under other clauses of the Constitution to address unintentional disparate impacts. This subject was addressed in the seminal case of Arlington Heights v. Metropolitan Housing Corp. (1977). In that case, the plaintiff, a housing developer, sued a city in the suburbs of Chicago that had refused to re-zone a plot of land on which the plaintiff intended to build low-income, racially integrated housing. On the face, there was no clear evidence of racially discriminatory intent on the part of Arlington Heights's planning commission. The result was racially disparate, however, since the refusal supposedly prevented mostly African-Americans and Hispanics from moving in. Justice Lewis Powell, writing for the Court, stated, "Proof of racially discriminatory intent or purpose is required to show a violation of the Equal Protection Clause." Disparate impact merely has an evidentiary value; absent a "stark" pattern, "impact is not determinative."