Far more significant than JFK’s assassination. Or 9/11. Or Apollo. And those are big. But for the lasting impact still to this day felt by that one secret agreement, nothing comes close to the Balfour Declaration.

It allowed the Nose revolution in Russia to transpire unhindered.

It bred Hitler and his causus beli.

It involved the U.S. in a war we had no interests in, costing untold American lives.

It allowed state-sanctioned quotas of Noses to emigrate from Europe to Palestine, which, despite their denials, was their first (and most important) step to creating their own ethno-state.