Bombing of Korea that destroyed virtually everything, killed at least 20% of the population in 3 years. Forced everything else to be shifted underground or into the mountains. Probably the closest comparison.
Siege of Merv by the Mongols in 1221 AD, where Tolui Khan is estimated to have killed between 700,000 - 1,300,000 in less than 10 days, with the complete destruction of the city which never resurrected.. that one siege alone trumps anything Palestine has experienced in a hundred years. Or more recently, as I pointed out in an earlier post, the annexation of Hyderabad by India in 1948, in which 200,000 Muslim civilians were killed in just 5 days.
There have actually occurred many more deadly events than this conflict, from all around the world. 25k killed in 3 days during the Bombing of Dresden, 1945; 150k - 250k dead in Hiroshima and Nagasaki; 1943 Bengal Famine created by the British killed upto 3.8 million civilians in a year.
This one is more documented, with more live coverage. It is the global outrage and condemnation that maybe doesn't have an equivalent precedent.
American Jewish lobby came to power before Israel and led to its existence. Israel lobby is really a misnomer. Consider Israel the spoiled son of the actual American Jewish daddy.
That's not true. The lobby formed many years after Israel's creation. Israel was a British construct with some European help. US was largely neutral at the time. Europeans preferred Jews to leave to anywhere; British preferred to have them exported to middleast to keep the Muslims in check. Americans welcomed Jews in droves; in fact, even explored the idea of a new Israel in Texas.
In 1950s Suez Crisis, when UK and Israel invaded neighboring countries, the US threatened Israel with UN sanctions if it did not retreat. Israel obliged. In the 1960s, the Israeli lobby formed, and when Israel invaded again in 1967, the US reluctantly accepted the occupation with a lot of condemnation. If the lobby existed in the 1950s, the Suez Canal as well as all of Gaza and Sinai Peninsula today would have been Israeli territory.
Early 1970s, President Nixon complained of excessive Jewish influence in Washington. Since then, those complaints have only increased, but before that it was never heard of.