Final answer:
Nellie Tayloe Ross was the first female governor in the U.S., serving as the governor of Wyoming beginning in 1925. Nellie McClung was a Canadian activist but not a governor. Other notable women in political history include Agnes Campbell Macphail and Roberta MacAdams in Canada.
Step-by-step explanation:
The first female governor in the United States was Nellie Tayloe Ross, who became the governor of Wyoming in 1925. However, your question seems to mix up different historical figures and their achievements. Nellie McClung was a Canadian feminist, politician, author, and social activist who was involved in women's suffrage movements and was part of the Famous Five in Canada, but she was not the first woman governor. On the other hand, Agnes Campbell Macphail was the first woman elected to the Canadian House of Commons, and Roberta MacAdams was one of the first two women elected to a legislature in the British Empire when she was elected to the Alberta Legislature in 1917, alongside Louise McKinney.
Women in politics, such as Nellie McClung, have made significant strides throughout history. Agnes Campbell Macphail and Roberta MacAdams are notable historical figures representing these advances in Canada, whereas Nellie Tayloe Ross is recognized as the first female governor in the U.S.