Black workers faced virulent racism on the job as well. In June of 1943 , white workers halted production to protest the promotion of their African American co-workers. Other factories faced habitual slowdowns by bigoted whites who refused to work alongside African Americans. 
not really sure if this is the exact answer you were looking for , I don’t know if 1943 is the exact date . but i Hope this helps !
        
             
        
        
        
A massive topic for this could be oil. You could talk about OPEC and the different types of technologies involved
 
        
             
        
        
        
The answer would be State legislatures. The Constitution provides that an amendment may be proposed either by the Congress with a two-thirds majority vote in both the House of Representatives and the Senate or by a constitutional convention called for by two-thirds of the State legislatures