What method of manufacturing, introduced in the early 1800s, made mad production possible

The method of manufacturing that made mass production in the USA possible was the implementation of interchangeable assembly parts leading up to the moving assembly line for large scale production.

the  wilmot proviso  was designed to eliminate  slavery  within the  landacquired as a result of the mexican war (1846-48). fearing the addition of a pro-slave territory, pennsylvania congressman david  wilmot proposedhis amendment to the bill.

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