Stephen Collinson: “The Roman Emperor Titus has one. Napoleon Bonaparte ordered up the world’s most famous example. And the Duke of Wellington’s iconic version is the gateway to London’s Hyde Park.”“Now, Donald Trump wants his own ceremonial arch. And his latest architectural passion project may tell history rather more about the 45th and 47th president than other examples of his second-term Washington makeover blitz.”“The Arch of Titus in Rome marks the capture of Jerusalem in AD 70. The Arc de Triomphe in Paris honors the dead of Napoleonic and Revolutionary wars and France’s subsequent fallen warriors. The arch honoring Wellington celebrates the French emperor’s eventual defeat.”“This history reveals one problem. Trump so far lacks the triumph to justify a triumphal arch.”