How was the creation of labor unions important to the American economic growth in the 1880s?

Labor unions codified the laws for workers in the country and made industrialized goods making a standard process.

Explanation:

The labor unions sprang up in the need of representation for the workers who were being suppressed by industries to work more.

The labor rights they asked for an standardization of wages and leaves and other rights of workers meant that the industry was made more administratively secure and similar to each other and then it led to better management and overall efficiency in the workforce began to rise with the rise of their influence too.