Final answer:
Between Jaques Cartier's journey in 1534 and Samuel Champlain's arrival in 1603, changes along the St. Lawrence River included the establishment of the first French settlement and the founding of Quebec as a fort and trading outpost. The French also formed alliances with local indigenous groups.
Step-by-step explanation:
Between the journey of Jaques Cartier in 1534 and Samuel Champlain in 1603, several changes occurred along the St. Lawrence River. Jaques Cartier claimed the mouth of the river for France and established the first French settlement, Charlesbourg-Royal. However, it wasn't until Samuel Champlain's arrival in 1608 that Quebec was founded and became a significant fort and trading outpost. The French also formed alliances with local indigenous groups, such as the Algonquian and Huron, which shaped local patterns and trade.