His mission was to complete an agreement with the Japanese Government for the protection of shipwrecked or stranded Americans and to open one or more ports for supplies and refueling. ... As a result, Perry's treaty provided an opening that would allow future American contact and trade with Japan.
The Monroe Doctrine's main purpose was to "<span>D. to warn European nations not to form new colonies in the Americas". It was a declaration of true sovereignty in the US. </span>
