Explore the Schlieffen Plan definition: Germany's WWI strategy to rapidly defeat France via Belgium. Understand why it failed, its role in creating trench warfare stalemate, and how its collapse reshaped 20th-century history. Comprehensive analysis of mechanics and consequences.

Explore the complex origins of the Vietnam War. Understand key debated start dates like 1955, 1959, and 1964, expert perspectives, historical timelines, and why the conflict's beginning remains contested.