Based on the text, it can be inferred that the effect of telling the story chronologically is to help the reader understand how the UMWA affected labor movements through history.
The text mentions several important events of the UMWA worker organization at the beginning of the 20th century. The text in particular is organized chronologically from the oldest event to the newest.
According to the above, it can be inferred that the chronological organization allows the reader to understand the significance of the workers' movement through a given time.
Note: This question is incomplete because the text is missing. Here is the missing part.
Read the excerpt from "Finding Unity in the Alabama Coal Mines."
The UMWA's efforts were so successful that they influenced practices in other trade unions as well. In 1901, arguments raised by UMWA members led to the repeal of discriminatory practices at the Birmingham Trades Council, the organization to which all unions in the city of Birmingham belonged.
Two years later, in 1903, the coal companies began to assert significant power against the union, denying union contracts and instituting policies of hiring only non-union employees. In 1908, under the auspices of the Alabama Coal Operators Association, company owners voted to cut worker wages by seventeen percent.
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