You don't need to go back so far: The Great Depression

Three of my four  white working class grandparents lost everything they owned, and there was no such thing as a social safety net, or labour laws, and the banks had free reign to take ALL of your stuff for missing a single loan payment. Lost their land, lost their homes, had no food to eat, and were displaced from their families.  The fourth had nothing of worth to take. Luckily they were from families of "good moral character" so that they were not subject to the machinations of (white, upper class, and often female) Eugenicists - who did not discriminate when it came to race or gender. 

You want to know how they repaid this country for the insult? By enlisting in the Army and killing fascists for 6 years. 

The working poor have nothing to feel guilty for, have done nothing to apologize for, and are in fact owed an apology of their own. We will never get one.