Final answer:
The US Supreme Court case Griswold v. Connecticut first declared that a constitutional right to privacy was implied. It struck down a state law prohibiting married individuals from using contraception, establishing the right to privacy as a fundamental right.
Step-by-step explanation:
In 1965, the US Supreme Court case Griswold v. Connecticut first declared that a constitutional right to privacy was implied. The case struck down a state law that prohibited married individuals from using any form of contraception. This decision established the right to privacy as a fundamental right, although it is not explicitly mentioned in the US Constitution. Subsequent cases, such as Roe v. Wade and Lawrence v. Texas, further expanded on the right to privacy in the context of sexual and reproductive decisions between consenting adults.