What major corporate decision influenced the general adoption of the eight-hour workday in the United States?

The Ford Motor Company played a pivotal role in the widespread acceptance of the eight-hour workday in the United States. In 1914, Ford made headlines when he not only instituted an eight-hour workday but also raised wages for his workers to five dollars a day, which was considered a substantial amount at the time. This decision was revolutionary and set a new standard in the labor market.

By adopting the eight-hour workday, Ford demonstrated that businesses could still be profitable and productive while treating their employees better. This shift not only improved the quality of life for workers but also encouraged other companies to follow suit, as it enhanced worker satisfaction and productivity. The impact of Ford's policies was significant in shifting public opinion and labor practices across the nation, contributing to the eventual standardization of the eight-hour workday in various industries.

The influence of Ford's decision is often seen as a catalyst for labor reforms and the push for better working conditions throughout the United States. In contrast, other companies mentioned in the question did not have a comparable direct impact on the establishment of the eight-hour workday during that period.