Final answer:
The kill ratio at the Battle of the Marianas heavily favored the United States, with the Americans inflicting significant damage on the Japanese naval air power.
Step-by-step explanation:
The Battle of the Marianas took place in June 1944 as part of the Pacific War during World War II. It was a major naval battle between the United States and Japan. The kill ratio at the battle of the Marianas was heavily in favor of the United States. The Americans sank three Japanese carriers, destroyed a significant number of Japanese planes, and effectively crippled the Japanese naval air power. On the other hand, the American losses were relatively low, with only 123 aircraft lost. This victory proved crucial for the American advance towards Japan.