What significant role did Susan B. Anthony play in U.S. history?

Susan B. Anthony is a prominent figure in U.S. history, best known for her crucial role in the women's suffrage movement. She dedicated her life to advocating for equal rights, particularly for women, and played an instrumental part in the struggle to secure the right to vote for women. Her work included organizing events, speaking publicly, and co-founding organizations that promoted women's rights and suffrage. Through her persistent activism, she helped raise awareness about gender inequality and mobilized countless individuals to join the fight for women's rights in America. This long and challenging journey ultimately contributed to the passage of the 19th Amendment in 1920, which granted women the right to vote.

The other options do not accurately represent her contributions; she was not a president, nor was her career focused on economic policies or military campaigns. Her legacy is firmly rooted in civil rights and social justice, particularly advancing women's rights.