1. Actually the Mexicans claim they do. Remember that the US took the land in war. (Texad Independence and then Mexican-American War).
2. The Arabs ethnically cleansed first. Ask the Jews of the West Bank communities that existed for 2500 years until the 1920's. For that matter, check out the Judenrein country of Jordan which is made up of 3/4 of Palestine.
3. Israel has Arab citizens. They constitute 18% of the Population and have full rights.
4. 2/3 of "Palestinains" are actually decended from immigrants from other Iraq, Syria, Egypt, and Lebanon who rented land. (only 9% of the land was owned by Arabs, and that number would be less had the Arabs no started assasinating Arabs who sold land to Jews.)
5. The Us has a right to ask illegal Mexicans to leave. Why not Israel?
For better or worse their children are Americans and can't be forced to leave. You seem to be arguing that Palestinians whose grandparents might have come to the country seventy years ago are still "illegal," while Jews who arrived in Israel yesterday are "legal." That looks like a very specious argument as regards the Palestinians.
Indeed your arguments cut against what you wish to say, since it can be shown that Arabs were a majority in Israel or Palestine down to about the time of WWII. If you can delegitimize Palestinians for having come in from elsewhere, that is still more true of Israelis. From 1870 to 1940 the Arab population about doubled. The Jewish population increased by something like fifty times. Even if statistics can be disputed, this does point out something that you neglected to mention.
This is not a black and white question that can be settled with a verdict for one side or the other. Certainly rhetorical quibbling can't establish that the Palestinians should have no say in things.
5. The Us has a right to ask illegal Mexicans to leave. Why not Israel?When we bought the Mexican Cession and the Gadsden Purchase, we did not expel the Mexicans living there.
-Eric