Singapore has been inhabited since the 7th century.
The Kingdom of Singapura was founded in 1299.
The arrival of the British and mass immigration of India and China in the 19th century altered the demographics and politics of the island, creating the foundation for modern Singapore.
There is far more evidence for the existence of Singapore than Palestine.
So, do you think Palestine was just an empty land until Europeans sent Jews there?
Why do you think Jews were sent to Palestine? Because Europeans were racist. Jews were persecuted in Europe for centuries: scapgoated for the black death plague, Inquisition by Spanish, Progrom by Russians, and Holocaust by Germans. Europe even needs anti-semit law to protect Jews from racism.
Relocating millions of Jews from Europe to Palestine was a bold racist act by Europeans. And you didn't even touch this issue.