According to president fillmore, why did he send commodore perry to japan? to reestablish foreign relations and to improve trade to learn about and understand japan's laws and culture to japan improve its government and modernize its culture to the chinese and dutch gain trading rights in japan.

The correct answer is  to reestablish foreign relations and to improve trade 

He wanted to have a safe haven for American merchants and travelers when they are in the Pacific and he also wanted to Japan  to trade with the United States since Japan was isolated for long and almost nobody had trading rights with them in the area. It was Perry's job to negotiate this and ensure treaties got signed between the two nations.