Which of the original thirteen states refused to attend the constitutional convention?

Rhode Island, is the right answer.

Explanation:

In September 1786, at the Annapolis Convention, representatives from 5 states required a Constitutional Convention so as to examine potential enhancements to the Articles of Confederation. The ensuing Constitutional Convention was to start in Philadelphia, meeting in the Old Pennsylvania State House (at that point getting to be known as Independence Hall) on May 25, 1787. Rhode Island, expecting that the Convention would work to its weakness, boycotted the Convention and, when the Constitution was put to the states during the following year of questionable discussions, at first wouldn't sanction it, holding up until May 1790 to turn into the thirteenth express, a year after the new government commenced.

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explanation:

a direct vote in which an entire electorate is invited to vote on a particular proposal. this may result in the adoption of a new law.