Final answer:
The Schlieffen Plan required violating the neutrality of Belgium to quickly defeat France in World War I.
Step-by-step explanation:
The Schlieffen Plan was a military strategy developed by Germany before World War I. According to this plan, Germany aimed to quickly defeat France by avoiding a two-front war. To achieve this, Germany needed to violate the neutrality of Belgium, a country located between Germany and France. The plan involved rapidly moving through Belgium to encircle and capture Paris.
Learn more about Schlieffen Plan and neutrality of Belgium