Johannesburg, Nov. 22 (Jiji Press)–The group of 20 advanced and emerging economies adopted a leaders’ declaration at a meeting that started Saturday, but without the participation of U.S. President Donald Trump, who boycotted the two-day summit in Johannesburg, South Africa, through Sunday. It is unprecedented for a U.S. president to skip a G-20 summit. Trump refused to take part in the Jo…