America has the largest middle class in the world. Such a huge class has brought huge economic demand and relatively stable social environment to the United States. From the perspective of American history, the role of trade unions is indispensable for the formation of such a strong middle class. Facts show that the main composition of the American middle class is not business owners or senior intellectuals, but a large number of working-class people, especially a large number of blue-collar working-class people without higher education. The formation of this social situation is closely related to several trade union movements in American history. Exploring the history of trade unions in the United States is helpful for how to build a trade union in line with China's national conditions. Let's break through the dark clouds of history and start from the beginning.

100 years ago, the vigorous trade union movement in the United States was the pioneer of the world workers' movement. Today, the well-known May Day International Labor Day is to commemorate the May 1886 Chicago "Grass Market Massacre" caused by the eight-hour working system of American workers. Early American trade unions carried out a series of activities to strive for economic benefits and social welfare for workers. But most of these early movements ended in failure.

It was not until the Great Depression that the trade union movement improved. Because the outbreak of the Great Depression caused a serious society, how to protect the working class and stabilize social order became an urgent problem for Roosevelt. In order to ease the tense labor relations and stabilize the increasingly unstable social order, the United States turned to trade unions. 1932, Roosevelt passed a bill to abolish the "(labor) contract" and prohibit workers from joining trade unions. From 1933 to 1936, the number of trade unions in the United States has tripled, and the effectiveness of the trade union movement has gradually emerged. Workers' wages have been greatly increased and their welfare has been gradually improved. In national output, the ratio of "labor output" to capital output has greatly increased.

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