Israel invaded Lebanon in 1982 and stayed for 18 years, killing many tens of thousands of people. The US funded the invasion and vetoed UN attempts to do anything about it. (Yes, that was a long time ago; the UN was less subservient to the US back then than it is now.) Israel invaded Lebanon to try to destroy the Palestine Liberation Organization, which was fighting against Israel because it had taken over the home of the Palestinians. (Yes, that was a long time ago; the Palestine Liberation Organization was less subservient to the US back then than its successors are now. Even Yassir Arafat, the man who would later bend over backward to appease the Israelis and their American boss, was much more strongly proPalestinian back then.)
The Zionist organizations had conquered the Palestinians' home in 1947-1949 and 1967, creating the State of Israel (which is actually occupied territory) and the Israeli-ruled West Bank and Gaza (today propagandistically called the "Occupied Territories," as if the rest of Palestine weren't).
The land Israel conquered during 1947-1949 had been roughly 70-88 % Palestinian-owned in 1947, and half of its people had been Palestinians in 1947, before they were driven out and their lands taken by the new state. These figures refer just to the land that Israel held between 1949 and 1967.
Since 1967, Israel has established itself as ruler over the rest of Palestine as well, though not all of this land is called Israel, because Israel does not want the Palestinian people (who might vote against Israel's antiPalestinian policies); it just wants control of their land. In Palestine as whole, there were twice as many Palestinians as Zionists in 1947.