A new national survey from the Cato Institute, conducted in collaboration with Morning Consult, of 2,253 Americans ahead of July 4 and America’s 250th anniversary, finds that nearly half (46%) of Americans don’t know what America’s 250th anniversary commemorates. A little more than half (53%) correctly answered that it was the adoption of the Declaration of Independence.Another risk to the country is low levels of substantive civic knowledge about basic governance questions. For instance, while 77% know George Washington was the first president, 58% don’t know the main purpose of the U.S. Constitution, and 57% don’t know why we declared...