In 1493, on Christopher Columbus second voyages to the West Indies, upon first sighting the island he named it after St. Martin of Tours because it was November 11, St. Martin's Day. However, though he claimed it as a Spanish territory, Columbus never landed there, and Spain made the settlement of the island a low priority.
The French and Dutch, on the other hand, both coveted the island. While the French wanted to colonize the islands between Trinidad and Bermuda, the Dutch found St. Martin a convenient halfway point between their colonies in New Amsterdam (present day New York) and Brazil. With few people inhabiting the island, the Dutch easily founded a settlement there in 1631, erecting Fort Amsterdam as protection from invaders. Jan Claeszen Van Campen became its first governor, and soon thereafter the Dutch East India Company began their salt mining operations. French and British settlements sprang up on the island as well. Taking note of these successful colonies and wanting to maintain their control of the salt trade, the Spanish now found St. Martin much more appealing. The Eighty Years' War which had been raging between Spain and the Netherlands provided further incentive to attack.
Spanish forces besieged the Dutch settlement in 1633, seizing control and driving most or all of the colonists off the island. At Point Blanche, they built Old Spanish Fort to secure the territory. Although the Dutch retaliated in several attempts to win back St. Martin, they failed. Fifteen years after the Spanish conquered the island, the Eighty Years' War ended. Since they no longer needed a base in the Caribbean and St. Martin barely turned a profit, the Spanish lost their inclination to continue defending it. In 1648, they deserted the island.
With St. Martin free again, both the Dutch and the French jumped at the chance to re-establish their settlements. Dutch colonists came from St. Eustatius, while the French came from St. Kitts. After some initial conflict, both sides realized that neither would yield easily. Preferring to avoid an all-out war, they signed the Treaty of Concordia in 1648, which divided the island in two.
A legend grew up around the division of the island. According to legend, in order to decide on their territorial boundaries, the two sides held a contest. It began with a Frenchman drinking wine and a Dutchman drinking gin. When both had sufficiently imbibed, they embarked from Oysterpond on the island's east coast. The Frenchman headed off along the coast to the north, while the Dutchman followed the coast south; wherever the two groups met was where they would draw the dividing line from Oysterpond. But as the Dutchman stopped at some point to sleep off the effects of the gin, the Frenchman was able to cover more distance and ended up with more land.
Though oft-repeated, the story is not historically accurate. During the treaty's negotiation, the French had a fleet of naval ships off shore, which they used as a threat to bargain more land for themselves. In spite of the treaty, relations between the two sides were not always cordial. Since 1648 conflicts have changed the border several times.
Although the Spanish had been the first to import slaves to the island, their numbers had been few. But with the new cultivation of cotton, tobacco, and sugar, mass numbers of slaves were imported to work on the plantations.