Explain one way labor patterns changed from 1928-1939

The origins of the labor movement lay in the formative years of the American nation, when a free wage-labor market emerged in the artisan trades late in the colonial period. The earliest recorded strike occurred in 1768 when New York journeymen tailors protested a wage reduction. The formation of the Federal Society of Journeymen Cordwainers (shoemakers) in Philadelphia in 1794 marks the beginning of sustained trade union organization among American workers.

Explanation:

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most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.