What is the name of the 1846-1848 conflict that resulted in the loss of nearly half of the national territory, including what are now California, Arizona, New Mexico and Texas?

• A War of the Reform
• B Mexican-American War ✓
• C Pastry War
• D Cristero War

The Treaty of Guadalupe Hidalgo ended the war and transferred approximately 1.3 million square kilometres of territory to the United States.