One of them had stopped unexpectedly as he and first lady Melania Trump were riding it toward the Assembly hall. The U.S. president’s “America First” credo has always been a tricky fit with the U.N.’s commitment to global-scale shared decision-making. The General Assembly ’s big week of meetings began Monday with events including a conference on the Israeli-Palestinian conflict. While the debate's theme is “Better Together,” observers can expect a rundown of ways in which the world is falling apart. Gaza already has seized attention at the General Assembly.