What was one reason why the equal rights amendment failed?

The Equal Rights Amendment or ERA for short, was an amendment that sought to end gender-based discrimination in the United States.

It didn't have the three-fourths of approval it needed in the Congress. Nevertheless, people believe the reason it failed on the voting was because campaigns to "Stop ERA", claiming it would eliminate laws created to protect women, claiming that if there was no difference between them they wouldn't need "extra" protection, rendering these laws useless. This prejudicial thinking might have influenced the congress to vote against ERA.

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