Equal protection is the principle that government may not deny any person within its jurisdiction the equal protection of the laws. In the United States, the doctrine is anchored in the Equal Protection Clause of the Fourteenth Amendment, ratified in 1868, which applies to the states; an equivalent constraint on the federal government has been read into the Fifth Amendment's Due Process Clause since Bolling v. Sharpe (1954).
US courts evaluate equal protection challenges under a tiered framework:
- Strict scrutiny applies to classifications based on race, national origin, or that burden fundamental rights. The government must show the law is narrowly tailored to a compelling interest.
- Intermediate scrutiny applies to sex-based classifications (Craig v. Boren, 1976) and to classifications based on non-marital parentage. The law must be substantially related to an important government interest.
- Rational basis review is the default, requiring only that the classification be rationally related to a legitimate government interest.
Landmark applications include Brown v. Board of Education (1954), striking down racially segregated public schools; Loving v. Virginia (1967), invalidating bans on interracial marriage; Reed v. Reed (1971), the first Supreme Court decision applying the clause to sex discrimination; and Obergefell v. Hodges (2015), which relied on both equal protection and due process to recognize same-sex marriage. In Students for Fair Admissions v. Harvard (2023), the Court held that race-conscious university admissions violated the clause.
Comparable guarantees exist internationally. Article 14 of the European Convention on Human Rights prohibits discrimination in the enjoyment of Convention rights, while Article 26 of the International Covenant on Civil and Political Rights (1966) provides a free-standing equality guarantee. Many national constitutions—including South Africa's 1996 Constitution (s. 9) and India's Constitution (Articles 14–15)—contain explicit equality clauses, though their doctrinal tests differ from the US tiered model.
Example
In *Obergefell v. Hodges* (2015), the US Supreme Court invoked the Equal Protection Clause to strike down state laws barring same-sex couples from marrying.
Frequently asked questions
Yes, indirectly. Since Bolling v. Sharpe (1954), the Supreme Court has read an equal protection component into the Fifth Amendment's Due Process Clause, binding federal actors.
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