how the Supreme Court's 1971 ruling in Lemon v. Kurtzman clarified the meaning of the First Amendment

The Supreme Court's ruling in Lemon v. Kurtzman played a significant role in clarifying the meaning and interpretation of the First Amendment of the United States Constitution. In this case, the court established the "Lemon Test," which provided a framework to assess the constitutionality of laws or government actions related to religion under the First Amendment's Establishment Clause.

Before the Lemon Test, there was ambiguity regarding how the First Amendment's Establishment Clause should be applied. This clause states that "Congress shall make no law respecting an establishment of religion." Lemon v. Kurtzman focused on state laws in Pennsylvania and Rhode Island that provided subsidies to non-public (mostly religious) schools. The plaintiffs argued that these laws violated the Establishment Clause.

The Supreme Court, in a unanimous decision, ruled that both statutes violated the First Amendment. Chief Justice Warren E. Burger, writing for the court, created a three-pronged test that judges could use to assess the constitutionality of laws concerning religion. The three prongs of the Lemon Test are as follows:

1. The law or government action must have a secular (non-religious) purpose.
2. Its primary effect must neither advance nor inhibit religion.
3. It must not foster an excessive government entanglement with religion.

The Lemon Test provides a framework for analyzing cases involving government actions that touch upon religion. It aims to ensure that the government does not establish or endorse any particular religion, avoiding state-entanglement with religious institutions and promoting religious neutrality.

Since the Lemon v. Kurtzman ruling, the Lemon Test has been used by lower courts to determine whether various government actions or laws violate the Establishment Clause. Although criticized by some as being overly complex and flexible, the test remains an essential tool for evaluating First Amendment cases related to religion.