As far as recent history, the clock starts in the 1890s, NOT in 1921 or 1947.  

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In 1897, the First Zionist Congress in Basle, Switzerland declared, "Zionism seeks for the Jewish people a publicly recognized legally secured homeland in Palestine" (Basel Program).

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Everything that the Zionists did after that was a conspiracy to steal land in Palestine.  

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One of the dishonest things they did was to quietly start paying poor Jewish people to move to Palestine in the early 1900s to flood the region with Jewish people.  They then started adding more Jewish people by providing aid and support groups to help the poor people that they had inserted into Palestine.  

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And instead of meeting in Palestine to "buy land," the Zionists congresses met with mostly the British and White Europeans for almost 30/40-years in places like Basle, Switzerland; London, England; and The Hague, Netherlands ... anywhere EXCEPT in Palestine which is exactly what con-artists would do if they wanted to keep the residents in Palestine uninformed.   Look at the pictures of the delegates at the First Zionist Congress.  I don't see people from the Middle East.

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For over 1,000 years, White Europeans expelled or murdered Jews. No one really wanted Jewish people in their own country so when the Zionists decided to steal land in Palestine in the 1890s, mostly White Americans and Europeans conspired to help them.  They had everyone in their back pocket before the people living in Palestine understood what was going on.

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None of the countries in the Middle East supported this plan.  The people living in Palestine were never fairly advised or consulted.  They never would have had anti-Zionist demonstrations and riots in the 1920s if people were so willing to sell land to Zionists.  When the Zionists invaded, it was a bum's rush ... a forcible and swift ejection.

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If I want to live or buy land in New York, I would certainly not go to North Korea or China to make deals.