Answer:
The answer to the question: What changes led to more Americans watching professional sports in the early 1900, would be: changes brought on by the use of electrical power that allowed for games to be played professionally and competitively, advancements in media technology, like T.V, which further increased the accessibility of people to watch these games, and finally, the policies on education and labor which encouraged people to play competitive sports, and thus the interest in them by the public in general.
Step-by-step explanation:
The world of sports is not a new one. Sports have been practiced around the world since ancient times. However, especially in the U.S, it was not until late in the 1850´s, and definitely in the 1900, particularly up to the 1950´s, that sports was revolutionized as the public had easier access to media, which allowed them to be able to watch sports games. But this was a chain reaction. First, with the invention of electrical power, and its use beyond a lightbulb, fed further inventions that used electrical power, such as T.V and other media. Both these technological advancements made sports available to the larger public. But there were also policies both laboral and educational, that further encouraged the people to become more and more interested in participating, and becoming fans of, competitive sports.