Britain’s King Charles III arrived in Washington yesterday for a high-stakes state visit aimed at salvaging frayed ties with Donald Trump, amid extra-tight security following an attack on a gala dinne... Courtesy can be tactical as well as virtuous. Key points and original sources are listed below.

• Britain’s King Charles III arrived in Washington yesterday for a high-stakes state visit aimed at salvaging frayed ties with Donald Trump, amid extra-tight security following an attack on a gala dinne...S1

• Courtesy can be tactical as well as virtuous.S2