That's because the island was invaded by pretty much everyone even though it was originally a French colony. British and Spanish armies also intervened and every time that the people would win and take control of the island, the French would just send numerous new soldiers to retake it. Just during Napoleon's era, 50 000+ soldiers died from yellow fever only.
A civilization is a group of similar people that are together for posterity. The establishment of a civiliation was caused by the tribal warfare of the stone age, the people did not want to live under constant fear of death, and thusly grouped together, built up the militarty and eventrall progressed into what we have today
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Homesteaders needed to live on their land for at least 5 years.