Donald Trump has signed off the UK’s handover of the Chagos Islands to Mauritius, Downing Street has indicated, paving the way for the UK to cede sovereignty over its last African colony after a six-month standoff. Under the terms of the deal, the UK will give up control of the Chagos archipelago while paying to maintain control of a joint US-UK military base on the largest island, Diego Garcia, under a 99-year lease. The agreement came under fire from senior Republicans in the US last year, and more recently some inside the UK government who questioned why the UK was...