Final answer:
The graph shows that American casualties at Iwo Jima were the second highest among major Pacific battles, with 22,000 casualties, only less than Okinawa.
Step-by-step explanation:
The graph depicting casualties in the Pacific during major battles of World War II indicates that at Iwo Jima, American casualties were significant. The United States suffered 22,000 casualties, which, when compared to the other battles listed, were not as high as Okinawa (44,000 U.S. casualties) but were higher than Saipan (16,000 U.S. casualties) and Leyte (16,000 U.S. casualties). Moreover, American casualties at Iwo Jima were roughly equivalent to the number of Japanese casualties there (20,000). Therefore, based on the information provided, it can be concluded that the casualty rate of American troops at Iwo Jima was indeed the second highest among the Pacific campaigns listed.