After the stock market crash, there was a recession in the economy because people weren't buying goods or spending money.
Under the treaty of the Guadalupe - Hidalgo , the Mexican American War ended in favor of the United States , this also relinquished the United States with 525,000 square miles of land from the Southern Border
The reason why reformers connect the abolition and women's rights issues is that the fight for the American African women's rights had also led and influenced women abolitionist to fight for their own rights too. These reformers are people who would want to bring gradual change in the society.
I am not sure what the others thought about it (for example Kahlo and Rivera were communists, so they likely believed it too!)
but a very good answer is <span>B. David Alfaro Siqueiros, since he was very opened about this view, stating it many times. </span>