Why did admiral yamamoto oppose war with the US?

Admiral Isoroku Yamamoto opposed war with the United States primarily due to his understanding of America's industrial capacity and military strength. He believed that a prolonged conflict with the US would ultimately be disastrous for Japan, as he feared that Japan could not sustain a long war against such a powerful adversary. Yamamoto's concerns were rooted in his experiences studying in the US and his awareness of American resolve and resources. Despite his reservations, he was compelled to follow the orders of Japan's leadership, leading to the attack on Pearl Harbor.