I think, to really understand Zion
ism in all of its iterations, it is useful to go back to the beginning. Zion is not a Hebrew word, but rather, designated a hill (mount) where the
Canaanites (Jebusites) had a hill fortress. The city itself was
not yet "Jerusalem", but
uru-salim, again, a Canaanite reference to their god, Shalim. (Israelites referred to it as Beth-Shalem - the House of Shalem).
According Hebrew texts (Tanahk), Samuel 5:7, David conquered the fortress, and uru-salim. Historians place this conquest about 1000 BCE.
"The term
Tzion came to designate the area of Davidic Jerusalem where the Jebusite fortress stood, and was used as well as
synecdoche for the entire city of Jerusalem; and later, when
Solomon's Temple was built on the adjacent Mount Moriah (which, as a result, came to be known as the Temple Mount), the meanings of the term
Tzion were further extended by synecdoche to the additional meanings of the Temple itself, the hill upon which the Temple stood, the entire city of Jerusalem, the entire biblical Land of Israel, and "the World to Come", the Jewish understanding of the afterlife." Wikipedia
That history is important to understanding what "Zion" came to mean to the Jewish diaspora, how it came to be described in the texts, and how it is used by other traditions. It was the place that displaced Jews longed to return to: In
Psalm 137, Zion (Jerusalem) is remembered from the perspective of the
Babylonian Captivity. "[1] By the rivers of Babylon, there we sat down, yea, we wept, when we remembered Zion." and for
others it came to represent a "promised land" - later the afterlife. Zion and Jerusalem came to be used interchangeably throughout the Tanahk (and later the Christian Bible's Old Testament). Zion is mentioned 152 times in the Tanakh.
Those uses, and those references, established an understanding and meaning that was adopted and adapted to Zion
ism, as came into existence in the late 19th Century. It is what drove the movement to reclaim the ancient lands. Wikipedia contains at least a half-dozen different entries about different aspects of it. The period from the beginning of the 20th Century through the Second World War was a period of militant Zionism. See, e.g.,
TERROR OUT OF ZION - IRGUN ZVAI LEUMI, LEHI, AND THE PALESTINE UNDERGROUND, 1929-1949.
Many academics refer to the period after the creation of the modern State of Israel as "
Post-Zionism" (as distinct from anti-Zionism), and the modern
neo-Zionist movement the successor to the militants of the pre-partition era. "In a widely cited 1996 essay, sociologist Uri Ram used the term Neo-Zionism to describe a political and religious ideology that developed in Israel following the 1967 Six-Day War.[3]: 18 [4]: 67 [5]: 218 He considers it as an "exclusionary, nationalist, even racist, and antidemocratic political-cultural trend" in Israel[6] that evolved in parallel with, and in opposition to, the left-wing politics of Post-Zionism and Labor Zionism."
The conflict between the post-Zionists and neo-Zionists informs today's conflict in Gaza, the West Bank, Jerusalem, Likud (and more extremist parties), and, most especially, the settler movement. That conflict exists not only within Israel, but throughout the entire Jewish and international community.