英语语法分析

Within the United States prior to 1920, for example, only less urbanized states had granted women suffrage.

例如，在1920年之前的美国，只有城市化程度较低的州才给予妇女选举权。

The economic development theory is inadequate to explain certain historical facts about the implementation of women's suffrage.

经济发展理论不足以解释关于妇女投票权实施的某些历史事实。

For example, why was women's suffrage, instituted nationally in the United States in 1920, not instituted nationally in Switzerland until the 1970's?

例如，为什么美国在1920年开始实行妇女选举权，而瑞士直到20世纪70年代才开始实行？