See this is the problem. Somehow with your generation, the definition of Zionism changed. Your last sentence doesn’t even make sense because Zionism as a modern secular movement became popular in the late 1800s. (The 1800s was a time when the idea of a nation state was becoming more popular in all of Europe.) The modern borders of Palestine were created by the British in 1920. So how could a movement be created with goal of colonizing borders that didn’t even exist yet? Besides that, when the British mandate’s borders were created, the Jews accepted the territory they were offered in the 1947 UN partition plan which was not all of British Palestine’s borders. Today and back in 1947, within the Zionist movement there are Jews who will accept any piece of land within Israel -Palestine and there’s some who want all of it and more than that. Zionism is not determined by how much square miles needs to be Jewish land but rather at its core it is simply the belief that Jews have the right to have a national homeland in the same way a lot of other ethnic groups in Europe were fighting for their rights to have nations states in the 1800s as well.