Why did one of the states refuse to send delegates to the constitutional convention?

They were distrustful of a federal government

Explanation:

2. Rhode Island boycotted the Constitutional Convention. America's littlest state had a big independence streak. Rhode Island, distrustful of a powerful federal government, was the only one of the 13 original states to refuse to send delegates to the Constitutional Convention.

Hope this help

answer; i believe that the correct answer is (chronological order);

b. second continental congress