You seem quite confused and conflating different things. No, Arabs didn't identify as Palestinians before 1948, the Jews did! Of course there was a region called Palestine, it was called this since Roman times after they expelled all the Jews as a punihsment for them to call them after their ancient and despised enemies the Philistines, but absolutely no national identity. Only Jews living in mandatory Palestine called themselves and identifed as palestinan. Fact.
When the Brits left on 15 May 1948, on that very day, the Palestinian zionists declared the State of Israel in place of the colonial mandate of Palestine. You know who didn't declare a state of Palestine? The Palestinian Arabs. Why? Please do tell us. Why did then 5 surrounding Arab countries INVADE the new state of Israel? Also, antoehr question. The Arabs held the Gaza Strip and West Bank from 1948-1967. Why was no State of Palestine established there? Why did Jordan annex the West Bank (including the old city of Jerusalem and they forbade Jews - not Israeli Jews but all Jews - from accessing their most holy sites) and why was that ok?
Let's not pretentd Israel doesn't have its sights on South Lebanon? Like seriously? What social media dirge have you been consuming! Israel has zero claims on South Lebanon and never has. Even all the years when Israel got itself involved in the Lebanese civil war and kept a security buffer in south Lebanon, it never made any claims of soverignty. Israel withdrew from every last inch of Lebanon in 2006 as certified by the UN. What did they get in return? Hezbollah inserting itself and preparing to attack Israel at the behst of Iran as indeed has happened. Just like what Israel got in return from withdrawing from Gaza. What lessons do you think Israel is learning from this? That withdrawing from territory leads to peace or to further attacks?
Why did Israel return Sinai? What did it get in return?
Israel also offered nearly all of the WB wth land swaps for the reamining small percentage, all of Gaza, land corrdidor linking the two and a Palestinian State in return for a recognition of an end to the conflict. This happened under Barak at Camp David, theis happened under Olmert at Annapolist. Both times the Palestinians refused to sign. They didn't want to give up the right of return to Israel, they didn't want civil war with their extremist elements.
I mean, FFS, you can't pin this all on Israel. yes, israel has made mistakes especially with the settlements in land which is under military occupation for palestinians. Yes, the compromises of a peace deal would have a biitter pill for Israelis to swallow and not all supported. yes, Israel has definitely moved to the right over the last couple of decades and is becoming less and less democratic. But there's also a reason for it. And you can't ignore the fact taht the Palestinians did not want a two state and do not want peace with Israel. Hamas was blowing up buses in the 90s in order to prevent a peace deal. The reason this is such a difficult conflict is precisely because there is fault on BOTH sides.
You really need to educate yourself on the history and poltiics of the region.