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> This was even after the Jews heavily funded the Spaniard military in the conquest of Gibraltar.

To be fair, it was also after they aided the initial Muslim conquest of Spain and assisted the new Muslim rulers in subjugating the native Christian population.

The purpose was to convert most of population to christianity to achieve cultural unity, and the ones who wouldn't convert had to leave. Usually it is explained only as an expulsion of the jews.

P.D: there are many theories around Gibraltar, specially since it was during succession war and the country was in a civil war.

I think it would have been more polite if they all converted to Judaism is cultural unity was the goal.

Your history seems wrong. The Alhambra Decree was issued on 31 March 1492. Columbus sealed his deal in April 1492, and started the first(!) expedition on 3 August 1492. And it seems he only reached the continent of America itself on his fourth expedition.