These Zionists came to an empty, underdeveloped land. As the Jews came so did the Arabs. These "Palestinians" are mostly immigrants just like the Jews. They came from other Arab area of the MidEast, pulled in by the projects of the Jewish immigrants. Who bought cheap swamp land and drained and developed it. Jews bought marginal land and made something of it that the backward Arabs could not.
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That, is absolutely true. The rest is in error according to prerevisionost Jewish history.
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That's a lot greater number than the number of Jews who immigrated there. When Herzl made the call for Jewish return to Zion, the initial migration was very small. Jewish immigration did not become large until just before the second world war. In 1937 the Jewish population swelled to 500,000 as a result of attempt to escape Hitler. At that time there were about 1,200,000 Arabs living there who wanted further Jewish immigration sharply restricted.