Which organization played a key role in advocating for the suffrage movement in the United States?

The organization that played a key role in advocating for the suffrage movement in the United States was the National American Woman Suffrage Association (NAWSA).

To find the answer to this question, you can follow these steps:

1. Start by understanding the context of the suffrage movement in the United States, which took place in the late 19th and early 20th centuries.

2. Look for information about the major organizations involved in the suffrage movement during that time.

3. Explore the goals and activities of these organizations to identify the one that played a key role in advocating for suffrage.

4. Finally, verify the answer by confirming the role of the identified organization in historical records and reputable sources.

The organization that played a key role in advocating for the suffrage movement in the United States was the National American Woman Suffrage Association (NAWSA).