Original: The following year , at the Convention of Kanagawa on March 31 , 1854 , Perry returned with seven ships and requested that the Shogun sign the '' Treaty of Peace and Amity , '' establishing formal diplomatic relations between Japan and the United States .
Simplified: Next year , on 31st March 1854 , Perry came with seven ships , and Japanese signed a treaty ( known as the Convention of Kanagawa ) established diplomatic relationship with the USA .