Answer:
He developed and implemented key battle strategies.
Step-by-step explanation:
Admiral Chester Nimitz helped in the war as the country weren't prepared and didn’t want to join in the war till the attack on Pearl Harbour happened by the Japanese. The Japanese had men all over the Pacific to prevent attacks.
Admiral Chester Nimitz devised an offensive tactics and infiltrated the region. His development and implementation of these key battle strategies helped the country defeat them in the war.