Why did many countries refuse to allow jews to immigrate ?

It was the great depression.

Explanation:

Many countries defended their positions to not accept refugees on their countries because the world was in recession and they couldn´t carry the load that jews coming from Europe needing assitance would represent, there were no jobs for the locals, and not enough food, adding people to that mix wasn´t convenient.

i belive the continental association was created to boycott all contact with british goods.

i also belive it was in december 1, 1774

sorry ill come back