Do you mean, why did the State of Israel call itself “Israel” and not “Palestine”? The end of the British mandate on 14 May coincided precisely with the declaration of the State of Israel, which was made that evening. A few minutes later the United States recognized Israel. Recognition from other countries would arrive in the coming hours and days.

Other than that I’m not sure I understand the question?

Thanks. Also, was this a cause to the first Arab Israeli war of 1948?