In a surprise nod to shared history, US President Donald Trump called China a World War II ally as he welcomed Xi Jinping to the White House on Thursday ahead of summit talks.But the historical reference was far from one-sided, with both leaders repeatedly referring to the joint fight against Japanese aggression as they sought to emphasise the long history of US-China friendship and the need to seek common ground.“If we focus on our common interests, I’m confident there is much we can...