Why did the Japanese and South Koreans want to become allies and make sure that they stay connected with the US?

During the occupation, Japan took over Korea’s labor and land. Nearly 100,000 Japanese families settled in Korea with land they had been given; they chopped down trees by the millions and planted non-native species, transforming a familiar landscape into something many Koreans didn’t recognize.

Nearly 725,000 Korean workers were made to work in Japan and its other colonies.

I don't know if this will help you, but it might!

answer; i believe that the correct answer is (financial and technology);