Up until the 1930’s, Zionism was pretty marginal within the Jewish community in Europe and the United States (and non-existent in Morocco, Iraq and other Arab-majority countries). It was the deteriorating situation of the Jews within Europe that made the dispossession of large numbers of Palestinians in 1947-9 possible.
The nationalist factions within Zionism did constitute the majority of Zionists in advance of the 1930s. However, there were dissenting voices, inside and outside of Zionism. More importantly, the small numbers of Jews in Palestine made the possibility of implementing a Jewish-majority Jewish nation state not something likely achievable, until the desperate situation of European Jewry significantly increased the amount of Jewish immigrants to Palestine. Those immigrants fleeing Europe were not, (at the beginning at least) ideological Zionists but rather running for their lives.
It’s probably worth noting here that the 1917 Balfour Declaration certainly complicated things, giving more hope to the nationalist Zionists than they should have had based on their numbers.