Ended the French and Indian War/Seven years war between Great Britain and France. France gave up all its territories in mainland North America, effectively ending any foreign military threat to the British colonies.
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The correct answer should be the constitution because nobody is above the constitution. There are rules there on how the government is chosen, how it is changed, how it is kept in check, and if something is unconstitutional it is banned instantly by courts, and the government can't do anything that goes against the constitution.
I would call this the 'Red Scare' as a phobia against communism or radical politics after WWI probably because the Soviet Union came out of WWI but on the contrary there were a lot of sympathizers to the cause of the Soviet Union and interest in their new experiment of actually trying to implement socialism at least among the Canadian and American working classes and many union members.