Another reason for French unhappiness was Germany's growing economic and military power. In the late 19th century, Germany rapidly industrialized and its military spending increased dramatically. This caused fears in France that Germany was planning to wage war against them, and they felt the need to arm themselves in response.
Finally, France and Germany had conflicting interests in Europe. France supported the status quo, while Germany was seeking to expand its power and influence. This led to disagreements between the two countries over issues such as the future of Alsace-Lorraine and the balance of power in Europe.
These factors combined to create a tense and hostile atmosphere between France and Germany, culminating in the outbreak of World War 1 in 1914.