What did President Fillmore request in his letter to the Japanese emperor, which was delivered by Commodore Perry?

In his letter to the Japanese Emperor, President Fillmore requested that the Japanese provide better treatment to American sailors who were shipwrecked on Japanese islands. Up to that time, the Japanese had treated such sailors as criminals, subjecting them to different kinds of torturous treatment and even keeping them confined in cages.

He wanted the US and Japan to live in friendship and to be able to trade with one another

He believed that combining the reserve in natural resource that possessed with the united states and the work ethic and cheap labor that possessed by Japan would resulted in positive trading enhancement for the two nations.