Roger Sherman was significant in the Constitutional Convention because he was an American politician whose plan for representation of large and small states prevented a deadlock at the U.S. Constitutional Convention of 1787.
Also, Sherman served as a delegate to the 1787 Philadelphia Convention, which created the United States Constitution. He ultimately supported the establishment of a new constitution, and proposed the Connecticut Compromise, which won the approval of both the larger states and the smaller states.
Frederick Douglass, William Lloyd Garrison, and John Brown all believed that slavery should be abolished. The people who share this common belief are called Abolitionists.