Answer:
The introduction of the bicycle is one of many factors that led to women’s liberation.
Step-by-step explanation:
This is the main idea of this introduction. In these lines, the author explains what the bicycle represented during its first years in America. She tells us that American women were severely limited in their actions by the assumption that women needed to play a secondary role in society. They most likely felt trapped in many different ways. With the bicycle, women were able to move independently and feel a sense of liberty. The author implies that in this way, the bicycle became one of the factors that led to women's liberation.