Ignorance and stupidity are not synonyms. Stupidity is inherited; it is in the genes. Stupidity can be made worse by poor nutrition in the first two years after birth. Permanent brain damage and a drop in IQ can result from hunger in infancy.
Ignorance, on the other hand, can be cured by education. Ignorance in the US seems to be on the rise judged by what I see on TV and on the internet. If ignorance is indeed on the rise, what is causing the increase? I believe that the corporate owned media are not doing their job and some in the media ( FOX News) are deliberately misinforming the public. It is in the best interests of the 1% to keep the voters ignorant and divided. Schools may be blamed for some of the ignorance. This is a subject about which I am ignorant, but that I intend to remedy.
The ignorant don’t know the difference between ignorance and stupidity. The stupid know the difference, but don’t care.