Seriously. Give it up. What made it not Israel?!
The reality is that the only legal entities which existed at the time are Israel Jordan and Egypt. You keep trying to pretend that there was another legal entity there. But there was not.
Who signed the agreements?! Israel. Jordan. Egypt.
Why did those three entities enter into agreements with each other?! Because they were the only three legal entities which existed! This is not rocket science.
There WAS no invisible ghost fourth entity. And even if there were it would STILL not prohibit Israel from existing.
I ask a question. You blow smoke.
Remember, the UN cannot create states. It cannot transfer any land or create borders. The armistice agreements merely restricted the movement of military forces. Palestine had no military. There were no forces to limit.
The armistice agreements divided Palestine into three areas of occupation. There is not one word of difference between Jordan's occupation, Egypt's occupation, and Israel's occupation.
Palestine was mentioned several times. A place called Israel was not mentioned. They said that the armistice agreements were to foster peace in Palestine. They did not say peace in Israel or peace in Israel/Palestine.
Palestinian land was mentioned. There was no land mentioned for Israel.
Palestine's international borders were mentioned. There were no borders mentioned for Israel.
So, back to my question that you ducked.
What happened since 1949 that made that territory Israel?