If there was one theme on the third day of the Republican convention, it was the focus on Americans who have been left behind, particularly in the Rustbelt of the industrial Midwest. After reconfirming that he was accepting the role as Donald Trump’s running mate, J.D. Vance told his own story of achieving the American dream, saying that this was becoming increasingly elusive. He repeatedly emphasised that he would not leave any Americans behind. Vance described his hometown as being “left behind” by the political elite, invoking Biden’s support for NAFTA and the Iraq War, and vowing to never …