What is the purpose of the outside source used in this excerpt? to show how strongly the american president insisted japan participate in international trade to show how the japanese government isolated the country from trade with other nations to educate readers about traditional art in japan to educate readers about american ships near japan?

An excerpt which states this passage "Many of the large ships-of-war destined to visit Japan have not yet arrived in these seas, and the undersigned, as an evidence of his friendly intentions, has brought but four of the smaller ones, designing, should it become necessary, to return to Edo in the ensuing spring with a much larger force." has a purpose to show how strongly the american president insisted japan participate in international trade.