Why is that USA refused on 1938 to accept immigrant Jews ?

The Évian Conference was convened at the initiative of US President Franklin D. Roosevelt in July 1938 to discuss the issue of increasing numbers of Jewish refugees fleeing Nazi persecution. For nine days, from July 6 to July 15, delegates from thirty-two countries met at Évian-les-Bains, France. Twenty-four voluntary organizations also attended, as observers, many of whom presented plans orally and in writing.[1] The fact that the conference did not pass a resolution condemning the German treatment of Jews was widely used in Nazi propaganda.[2] The lack of action further emboldened Hitler in his assault on European Jewry. Many historians refer to the Evian Conference as "Hitler's green light for genocide