Final answer:
The wording comes from the Equal Rights Amendment (ERA), which was meant to guarantee legal gender equality but was not fully ratified.
Step-by-step explanation:
The wording you provided is from the proposed Equal Rights Amendment (ERA), which stated that "equality of rights under the law shall not be denied or abridged by the United States or by any state on account of sex." While the ERA was introduced in every session of Congress since 1923, it was passed by Congress in 1972 but ultimately fell short of being ratified by the necessary three-fourths of the state legislatures. The text bears a resemblance to the 19th Amendment which grants women the right to vote, but it is not the same as the ERA's goal was to guarantee broader legal gender equality.