You can't compare the United States to the Middle East. Europe, if anything, is the model of bi-national or multi-national states, and the history of such states is far from encouraging. The onus for proving "one state" would be a viable solution for Israelis and Palestinians is on its advocates. In the Middle East, there are NO bi-national states, and non-Arab and non-Muslim minorities are systematically repressed by the Arab/Muslim majorities. Israel-Palestine would very quickly turn into a morass of ethnic tension, power struggles, leading to civil war. And the current wars and power struggles between Sunnis and Shi'ites, Arabs and Kurds should give any "one state" advocate a reason to reconsider their position. As far as everyone "getting along" in the US, well that is quite the overstatement given that race remains a major factor in US society and politics. And, the democratic neighbor to the north, Canada, has a very strong and active national secessionist movement in Quebec, with lots of tensions between the French and English speaking populations.
Donald Trump: Israeli settlement construction in West Bank should 'keep going' (Haaretz)
from the article: A utopian Arab city in Israel? Turn left at Route 65