Yeah basically. There was already prior political pressure from the Zionist movement before WW2, and when the UK decided to get the fuck out of Mandatory Palestine they signed off on Zionists' plans there. The UN was then quite generous to Israel in the partition plan, and hoped that they could live in harmony with the Arab in an economic union with equal rights and everything. But then Israel, with it's population and army swelling from post-war immigration, realized that there would basically be no consequences if they just took more Palestinian land by force (insert "it's free real estate" meme). And well, Israel has been trying to ethnically cleanse the territory ever since.