Amy v. The Supervisors is a landmark United States Supreme Court case that established the right of women to vote in municipal elections. The case was brought by Amy, a woman living in San Francisco, who was denied the right to vote in a municipal election. She argued that the Fourteenth Amendment of the United States Constitution, which guarantees equal protection under the law, should apply to her as a woman and grant her the right to vote. The Supreme Court ruled in favor of Amy, holding that the Fourteenth Amendment did indeed apply to her and that she had the right to vote in municipal elections. This ruling was a major victory for women's rights, as it established the precedent that women had the same rights as men under the Constitution. This case was also significant in that it was the first time the Supreme Court had ruled on the issue of women's voting rights. The decision in Amy v. The Supervisors was a major step forward for women's rights in the United States, and it set the stage for further advances in the years to come. This case established the precedent that women had the same rights as men under the Constitution, and it was a major victory for the women's suffrage movement.

In the case of Amy v. The Supervisors, Justice Field delivered a dissenting opinion in which he argued that the Fourteenth Amendment did not grant Congress power to pass legislation regulating state taxation. He believed that this was an issue for individual states to decide and should be left up to their own discretion. Furthermore, he argued that if Congress had such authority it would lead to an “unlimited interference” with state governments and could potentially undermine them altogether. In addition, Field noted that while some taxes may have been discriminatory against certain individuals or groups of people, they were still within the rights of each respective state government as long as they applied equally across all citizens regardless of race or gender. Ultimately, his dissent concluded by stating that any attempt by Congress to regulate taxation on a federal level would be unconstitutional and beyond its scope under the Fourteenth Amendment.