The Third French Republic, established in 1870 following the fall of Napoleon III, led to significant social, political, and cultural changes in France until 1914. The national assembly's struggle against monarchist sentiments culminated in the establishment of a republican constitution, while France's involvement in imperialism and internal challenges, such as the Boulanger case, tested its republican foundations. Despite progress, the period was marked by political strife, economic development, and evolving cultural identities that defined modern France.