(FILES) In this file photo taken on May 01, 2018 Cuban President Miguel Diaz-Canel (L) listens to former president Raul Castro during the May Day rally at Revolution Square in Havana. - Opening to market and private investment without giving up socialism: this is one of the main changes in the new Cuban Constitution, which also limits the presidential mandate and ushers in homosexual marriage. The text, which will replace the current Magna Carta, which dates from 1976, will be submitted to a referendum on February 24. (Photo by Yamil LAGE / AFP)YAMIL LAGE/AFP/Getty Images
(FILES) In this file photo taken on May 01, 2018 Cuban President Miguel Diaz-Canel (L) listens to former president Raul Castro during the May Day rally at Revolution Square in Havana. - Opening to market and private investment without giving up socialism: this is one of the main changes in the new Cuban Constitution, which also limits the presidential mandate and ushers in homosexual marriage. The text, which will replace the current Magna Carta, which dates from 1976, will be submitted to a referendum on February 24. (Photo by Yamil LAGE / AFP)YAMIL LAGE/AFP/Getty Images YAMIL LAGE AFP/Getty Images
(FILES) In this file photo taken on May 01, 2018 Cuban President Miguel Diaz-Canel (L) listens to former president Raul Castro during the May Day rally at Revolution Square in Havana. - Opening to market and private investment without giving up socialism: this is one of the main changes in the new Cuban Constitution, which also limits the presidential mandate and ushers in homosexual marriage. The text, which will replace the current Magna Carta, which dates from 1976, will be submitted to a referendum on February 24. (Photo by Yamil LAGE / AFP)YAMIL LAGE/AFP/Getty Images YAMIL LAGE AFP/Getty Images