Final answer:
The Netherlands gained land through the Eighty Years' War and lost land during the French Revolutionary and Napoleonic Wars and World War II.
Step-by-step explanation:
The conflicts that led the Netherlands to gain or lose land include the Eighty Years' War (1568-1648) against Spain. During this war, the Dutch Republic gained independence and control over parts of present-day Belgium and Luxembourg. Another major conflict was the French Revolutionary and Napoleonic Wars (1792-1815), where the Netherlands lost territory to France. Additionally, World War II (1939-1945) led to the Netherlands losing control over colonies such as Indonesia and Suriname.
Learn more about Conflicts and territorial changes in the Netherlands