The first Group of 20 summit in Africa broke new ground this weekend by putting the priorities of poor countries at the top of the bloc’s agenda. Host South Africa negotiated a summit declaration in Johannesburg signed by some of the world’s richest and top emerging economies that agreed to give more global attention to issues that especially affect developing nations. From Monday, the U.S. takes over the rotating presidency of the G20. And with the Trump administration boycotting South Africa's summit and rejecting its G20 agenda, it leaves the long-term impact of the Johannesburg declaration unclear.