The world premiere of Mary D. Watkins and Cerise Lim Jacobs’ opera, “Is This America?” is presented by White Snake Projects on Sept. 20. This new 90-minute fully-staged opera celebrates the life and legacy of civil rights activist Fannie Lou Hamer. “Is This America?” features mezzo-soprano Deborah Nansteel in the lead role, alongside bass-baritone Eliam Ramos-Silva, and Voice Boston Children’s {…}