What did the second continental congress accomplish?

Accomplishments of the second national congress:

A meeting held among all the delegates from all the American colonies at the period of Revolutionary war is called the Continental Congress. Since the continental congress was not as successful as expected, a continental congress was held in the year 1775.

The following are its accomplishments:

By signing the articles of the confederation on 1st March 1781, a real government was formed and congress is renamed as  Congress of the Confederation.  

yes.

explanation:

because it let the japanese know who had the upper hand in the war.