HAVANA, CUBA - MARCH 21: President Barack Obama and John Kerry, U.S. Secretary of State, listen to the playing of the U.S. National Anthem as they take part in a wreath laying ceremony at the Jose Marti memorial in Revolution Square on March 21, 2016 in Havana, Cuba. Mr. Obama's visit is the first in nearly 90 years for a sitting president, the last one being Calvin Coolidge. (Photo by Joe Raedle/Getty Images)
