What Do You Think Is the Most Important Problem Facing This Country Today?’ -br By GREGOR AISCH and ALICIA PARLAPIANO FEB. 27, 2017br Since the presidency of Franklin D. Roosevelt, the Gallup polling organization has asked Americans an open-ended question: “What do you think is the most importantbr problem facing this country today?”As Donald J. Trump prepares for his first major address to the nation on Tuesday, he has a unique set of issues to tackle.