Final answer:
Dien Bien Phu (1954) teaches about the power of national independence movements and the limitations of colonial powers against such forces, as demonstrated by the French defeat and their subsequent withdrawal from Indochina.
Step-by-step explanation:
The lesson that Dien Bien Phu (1954) invokes is a powerful example of the struggle for national independence and the limits of military power against a determined opponent. The French fought to regain control over Vietnam post-World War II, but the Vietnamese led by H o Chi Minh were driven by a strong sense of nationalism and utilized effective guerrilla tactics that culminated in the French defeat at Dien Bien Phu. This battle proved to be a turning point, leading to the withdrawal of France from Indochina and setting the stage for future conflicts, including the Vietnam War which involved the division of Vietnam into a communist North and a non-communist South.