Zionism is the national movement of the Jewish people that supports the re-establishment of a Jewish homeland in the territory defined as the historic Land of Israel.
The Zionism movement is not by nature to the exclusion of other people who have settled in the historic Land of Israel. The fact that there is a conflict situation is not due to Zionism.
In 1947, the United Nations proposed the Partition Plan offering Jews and Arabs their own states. The Jews accepted the Partition Plan while the Arabs rejected it, with a number of Arab states starting a war in 1948 that they lost. The rejection of a peaceful solution by the Palestinians and Arabs has been an ongoing theme since then.
Useful reading:
Why AntiZionism is antiSemitism https://threadreaderapp.com/thread/1089598110672785408.html
The War of Independence: The Sin of Israel’s Creation?
No Peace with Israel
No Recognition of Israel
No Negotiations with Israel
How the UN Partition Plan led to Israel’s birth