True Comics #21

True Comics #21 is an anthology featuring multiple factual stories. One story depicts the training of glider pilots, explaining how students learn to fly small gliders before progressing to larger aircraft, with instruction in aerodynamics and gliding angles. Another story involves a man falsely accused of being a traitor named Booth, who is arrested and prepared for trial while maintaining his innocence. A third story covers American history, including the Mexican-American War and the Battle of the Alamo, the subsequent territorial gains stretching to the Pacific, the California Gold Rush of 1849, and California's admission to the Union in 1850.