Final answer:
The Treaty of Frankfurt ended the Franco-Prussian War with France ceding territories to Germany and paying a large indemnity, contributing to future tensions.
Step-by-step explanation:
The key terms of the Treaty of Frankfurt, which ended the Franco-Prussian War in 1871, were significant for both France and Germany. The Treaty required France to pay a large indemnity to Germany and to cede the territories of Alsace and a part of Lorraine. Moreover, German troops were to remain in parts of France until the indemnity was paid. These harsh terms led to resentment and a desire for revenge in France, which contributed to the tensions leading up to World War I.