How did industrialization bring about the development of labor unions?

During the Industrial Revolution, the working conditions in factories, mills, and mines were terrible. ... They joined together and created unions in order to fight for safer conditions, better hours, and increased wages.

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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