Why did sadao father send him to America although he considered American as his enemies?

Sadao's father sent him to America to receive the best education possible, recognizing that knowledge and skills were essential for success, even if it meant studying in a country he considered an enemy. He believed that Sadao could contribute to Japan's progress by learning advanced medicine and techniques from the West. This decision reflects a pragmatic approach, valuing education over national prejudices, and an understanding that advancements could ultimately benefit their homeland.