Under State Department control for 68 years, US foreign policy relating to Israel specifically and the Middle East as a whole was made in deliberate defiance of reality. In the case of Jerusalem, rather than recognize the plain fact that Jerusalem is Israel’s capital city, the State Department insisted on pretending that Israel has no capital. This position was a central component of an overall US Middle East policy that the State Department similarly based on a defiant rejection of observable reality.
So it happened that for decades the US ignored the multiple, systemic pathologies of the Arab and Islamic world and opted instead to predicate its policies on the false assumption that the problems of the Middle East are rooted in Israel’s refusal to sufficiently appease the Arab world.
By rejecting the State Department’s position on Jerusalem, and by noting that its position is rooted in a rejection of reality, Trump initiated a new course for US Middle East policy rooted in reality for the first time in three generations.