Final answer:
France experienced significant setbacks including defeats at Kennebec River, loss of the Senegal outpost, and the unfavorable conditions of the Treaty of Aix-la-Chapelle.
Step-by-step explanation:
Between 1675-1677, during a period of colonial expansion and military engagements, France faced several setbacks. Notably, these included a series of embarrassing defeats in the region around the Kennebec River during King William's War, where British and colonial forces consistently overcame the French due in part to insufficient military support from French leaders, who were preoccupied with conflicts in Europe and elsewhere. Additionally, the British capture of the French outpost of Senegal in West Africa in 1758 represented a considerable economic and strategic loss for France, as it deprived them of valuable trading ports and bases to raid British shipping. Lastly, the Treaty of Aix-la-Chapelle in 1748, while not within the exact timeframe, epitomized the theme of French disappointments by returning gains, such as control of Louisburg, back to the British, laying the groundwork for future conflicts.