By 1685, there were 22 houses in Beaubassin, and finally, in 1686, the area was constituted into a parish. It is in this year that a priest, Father Claude Trouvé, of Quebec, built Beaubassin's first church. The parish church was situated exactly where today stands a monument indicating the establishment of Fort Lawrence, built in 1750. Today a railroad crosses that church's cemetery. Beaubassin continued to develop between 1686 and 1714, as young colonists of Port-Royal, the Saint John River, Québec, France, and Acadia established themselves in Beaubassin. On September 25th, 1697 the treaty of Ryswick officially declared that Acadia belonged to France.

Beaubassin continued to improve with the help of Jacques Bourgeois, who built a flourmill and a sawmill with materials he obtained in Boston. Beaubassin soon began importing a large part of necessary goods for the Acadian population from their English enemies in Massachussetts. When Roger Kuessey, a young Irish refugee who had settled in Port-Royal in 1671, arrived at Beaubassin, he brought with him the first fruit trees. The Acadians could now grow apples, pears and plums, but there was still very little ploughed land in Beaubassin before the deportation. The women made their own muslin, socks, and shoes. Pelts came from fur trading with the natives in the area. Most families possessed between twelve and fifteen sheep, used for wool, while some even had as many as twenty. Every family also had approximately twelve pigs. The Acadians got their necessities from an English ship from Boston, making New England the main supplier to the Acadians. The English accepted furs in exchange for manufactured good, but these transactions put the Acadians so deep in debt, since money was in such great demand, that they had to work for the English in order to re-pay them. Commonly, Acadian men spent their lifetime fishing for the English, only to receive credit at English-owned stores set up in the French villages. This turned Beaubassin into the junction point between the rest of Canada and Acadia since you could arrive by boat from the Gulf of Saint Lawrence.

Conflicts with the English people began long before the deportation in the region of Beaubassin. This was because the borders of this region were never definitively determined; while the Acadians held that Beaubassin belonged to them, the English held it was theirs. The first attack on the Acadians of Beaubassin was in September of 1696, when Anglo-Americans arrived and killed their cattle, destroyed the harvests, and burned their homes. Fortunately, most of Beaubassin's population had enough time to take refuge in the forest. In May 1704, when Beaubassin counted 200 inhabitants, The English Americans advanced to this region once again. On July 28th of this year the English set fire to about twenty houses and killed all the animals in the fields. The English did not advance, and in 1710 the terms of the surrender applied to 500 inhabitants of Port-Royal only; French Acadians in Beaubassin were safe from the English for the time being.

At the time of the deportation, in 1755, the Acadians of Beaubassin were the first to be taken as prisoners, on August 10th 1755. Charles Lawrence, lieutenant governor of the Nova-Scotia, ordered that the first Acadians arrested would be of Beaubassin because of their previous mischief with the English. A large portion of the inhabitants of this region hid in the forests on the advice of their priest, Father LeGuerne, who was warned in advance of the English attack. Two thirds of the population of Beaubassin therefore escaped the deportation. However, many of these Acadians were arrested by the English, and detained in Fort Cumberland, once Beaubassin. But not all Acadians of this region were able to hide in time, because on October 27th, 1755, 1 900 Acadians from Beaubassin were put in ten vessels.Approximately 1000 of these Acadians were deported to North and South Carolina. Most were native of Beaubassin and were left in Charleston. About 400 of Beaubassin's Acadians were deported as far as Georgia because they were guilty of rebellion.By 1758, at the border of the Ristigouche River, at the bottom of the Bay des Chaleurs, were Acadian refugees, most of who were native, either of Beaubassin, Pisiguit, or Grand-Pré. Acadians from Beaubassin who escaped the deportation by hiding in the forest were among the first Acadian families of the region of Saint-Charles-de-Bellechasse. At l'île Saint Jean we also counted numerous families native of Beaubassin.

Acadians never had the right to return to Beaubassin, thus the parish was never rehabilitated after the deportation. At the beginning of the century, we fortunately found in La Rochelle, France, the strongest part of Beaubassin's censuses, covering most of the years between 1712 and 1748. The English remained in the place, which is best described today as Amherst.