Ze'ev Jabotinsky was an author, poet, orator, soldier and founder of the Revisionist Zionist movement. His legacy, thoughts and policies are proving right (pun intended) and are ever-increasing particularly in view of recent events.

I grew up in a family of Jabotinskites (like him, my father was born in Odessa to a Zionist family) which made me the ardent fervent unrelenting Zionist I have always been and will remain so for the rest of my life. 

If you are not familiar with this incredible leader, his genius, his eloquence and his actions, I suggest you make an effort to read more about him, his life, and his enormous literary and political output. Some of his books are translated into English. Google it.

Meanwhile, here is a good article about him.

the Balfour Declaration was basically a statement of British policy; it did not establish legal rights. This first occurred with the meeting of the victorious allied powers at San Remo, Italy in 1920, where they adopted the Balfour Declaration in an international agreement. Then in 1922, 51 members of the League of Nations approved the document for the Palestine Mandate.

the Ottoman census already showed a Jewish majority in Safed in the 16th century. European consular reports in the 19th century showed that by the 1860s the Jews re-established their majority in Jerusalem -- decades before British armies took over the Middle East. The Balfour Declaration reflected a historical trend that was already underway, but it did not launch the Jewish return to Eretz Israel.