1914-1918
World War I: Britain and her allies fight Germany and the Ottoman Empire.
Ahad Ha'am [Asher Ginsburg] and the Cultural Zionists join the Political Zionists in the search for a "charter" for the Jewish homeland.
1915
MacMahon-Hussein correspondence
Zion Mule Corps established by Yosef Trumpeldor in British Army.
1916
Sykes-Picot Agreement divides Middle East into spheres of British and French influence
1917
November 2: The Balfour Declaration 
December: British Conquest of Palestine - General Allenby enters Jerusalem.
1918
Britain appoints Zionist Commission from within the Zionist leadership, to advise them on implementation of Balfour Declaration.
1918-19
Weizmann-Feisal understanding
1919
Chaim Weizmann heads Zionist delegation at the Versailles Peace Conference. Treaty of Versailles is signed.
1920
Fall of Tel Hai to Arab attackers, death of Yosef Trumpeldor. 
British awarded Mandate over Palestine; Sir Herbert Samuel appointed High Commissioner.
Histadrut and Haganah founded.
1919-1923
The Third Aliyah begins, mainly from Russia.
1921
Jaffa riots - Yosef Chaim Brenner killed during the violence.
First Moshav, Nahalal, founded.