What is a nation's fleet of commercial ships called?

A national memorial in which city marks the site of the April 19, 1995 bombing that killed 168? A National Monument in Cork, the second city of which country, honors Irish rebels including those of 1798? A national weapons lab in Livermore, California, is named for which physicist who invented the cyclotron? Which nationally syndicated columnist also hosted the TV show "Firing Line" from 1966 to 1999? Which native of Cardston, Alberta, co-starred with King Kong in 1933? What word names a native of Flanders and is also the surname of skater Peggy? A native of Ripon, Wisconsin, suffragist Carrie Chapman Catt founded which organization in 1920? Which citrus fruit's name means "native of Tangier"?