Yes, Israel was given to the Jewish people by God, because God promised to many leaders throughout the Bible that it would be the land that they would inherit. God told Abraham that his descendants would number as many as the stars. He told David that he would receive the promised land. Jesus promised the land of Israel too. If other countries want to be blessed, they will support Israel's right to this land.
Yes, the land of Israel was given to the Jewish nations by God. The Bible is very clear about that. Of course, those who do not believe in God and in the Bible would disagree, but I guess the question itself rules out such a viewpoint. If I have to prove the Bible and God first, it would turn into too long of a discussion.
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