What were the obstacles in the women's suffrage movement?

Great question!
Women's suffrage encountered religiously sanctioned tradition that held that in marriage, man and woman become one flesh. In the patriarchal societies of Great Britain and the United States, the two countries where the movement for suffrage became most intense in the early 1900s, the woman in the marriage was understood to merge with the man. His vote was her vote. To imagine otherwise was to challenge the foundation of marriage as it was then conceived.
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Hope you get an A!