Open this photo in gallery:Aliyah Abraham presents King Charles with a necklace upon his arrival at Umana Yana during his visit to Guyana on Friday.Chris Jackson/Getty ImagesRoyal tours are usually full of carefully planned photo ops, cultural festivities and smiling children offering a warm welcome. That hasn’t entirely been the experience for King Charles III during his current tour of the Caribbean, where he’s had to contend with awkward questions about slavery and reparations. The King’s trip has included stops in the Bahamas and Guyana, and it culminates on Sunday in Antigua with the start of the Commonwealth Heads of...