By the end of the first 150 years of British rule in North America,a partial religio-political equilibrium between the dominant Protestant ruling class and Roman Catholicism was established.Which of the following was a watershed decade during which that equilibrium began to be challenged?

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The 1860s saw the emergence of Fenianism, a movement of Irish nationalists who sought independence from Britain and the establishment of an Irish republic. Many of the Fenians were Roman Catholic, and their activism challenged the existing religio-political equilibrium between Protestants and Catholics in North America. This led to increased tensions and sectarian violence, particularly in Ireland and in cities with large Irish immigrant populations such as New York and Boston.

By the End of the First 150 Years of British