A presentation on the roots of statehood in advance of Maine’s bicentennial in 2020 by Liam Riordan, a professor of history at the University of Maine, will air on Harpswell TV at 7 p.m. March 15. Riordan gave the talk, “Bicentennial Beginnings: Setting the Stage for Statehood,” Feb. 8 in Brunswick. The broadcast also is read more Riordan’s bicentennial talk to be broadcast around state