The correct answer is: a. Fourteenth Amendment
The Fourteenth Amendment to the United States Constitution, ratified in 1868, defined citizenship and granted it to all individuals born or naturalized in the United States, ensuring that they were recognized as American citizens.
The Fourteenth Amendment stands as the foundational federal legislation declaring birthright citizenship in the United States. Ratified in 1868, it solidifies citizenship for anyone born or naturalized within the nation's borders.
This pivotal amendment ensures that all individuals, regardless of their ancestry or circumstances of birth, are recognized as American citizens, establishing an enduring principle of citizenship based on birth location or naturalization.
Its enactment represented a significant stride toward equality and inclusion, affirming the citizenship rights of those born on American soil and emphasizing a fundamental aspect of American identity and constitutional protection.