We heard you about the BS the first time.
I don't think you understand the rights of employers to fire.
Layoffs have to follow certain laws in the US, including rules about replacements. Employers CAN fire you, replace you, and not give you any severance at all.
If it falls under civil rights violations (race, gender, age, etc.) you can try a lawsuit.
The lawyer will cost you money up front. What if you don't win? People here are claiming you have little to no chance; maybe the lawyer just needs money.
If the company has published policy about warnings, probation, and other steps before firing, then you might have a case. But you haven't said that they do.
As for just wanting to know what points to make in a letter, I won't waste the time, and we still know too little anyway. I am puzzled that you still think there is some sort of generic template for this demand letter.