"C'est toute, Acadie" could also mean "That's all, Acadie" implying that it is over, finished or lost, rather than "it is all Acadie"
Rather than use French it would be better to translate using Cajun French.
It is conveniently forgotten by most that the plight of the Acadien refugees was greatly increased by the attitude of the American Colonies along the eastern seaboard, who would either not take them in, or who would only accept them as white slaves. Many found their way back to France (a place they had greatly desired never to see again) and it was these lucky ones who eventually found favour with the Spanish who were trying to find catholic settlers for their province in Louisiana to act as a buffer against the protestant americains.