Not sure where you're going here.
I actually had to Google "Cajun", as I have zero knowledge of the word, other than in relation to Louisiana and cooking.
Apparently your "Cajun" originated from the "Acadians", people of French origin, living in what would become Canada more than one hundred years later.
Essentially, this bad history to which you refer, was just more of the ongoing disputes in the New World, between Britain and France. Many of the Acadians were deported during the "French and Indian War - 1756-1763; many more decided to leave the British-held territory during the 18-month "unrestrained emigration" following the signing of the "Treaty of Paris" in 1763.
Canadian Confederation did not take place until July 1, 1867.
So, essentially the mistreatment of the Acadians/Cajuns was at the hands of the British.
Now, if you want to talk about the outrageous internment of Japanese Canadians following the bombing of Pearl Harbor ... that is another issue altogether.