What is the meaning of "national psyche"?

Can it be used in a sentence like "This mentality should be erased from our national psyche"?

The term means something like the collective thinking or attitude of a nation as a whole. Obviously, not every single person in a country, especially one as large and diverse as the US, will think exactly alike, but this term is used to indicate the general thinking across the nation.

Yes, your sentence is fine IF you are clear what "this mentality" is.

thank you. yeah i was using it in an essay and already defined what the mentality is in the previous sentence.

You're welcome. Everything should work fine, then! =)

The term "national psyche" refers to the collective mindset, attitudes, beliefs, and characteristics of a country or nation. It refers to the shared values, traditions, and emotions that shape the identity of a nation as a whole.

Yes, the phrase "This mentality should be erased from our national psyche" is a fitting way to use it in a sentence. It means that a particular mindset or way of thinking that exists within the national psyche should be eliminated or changed. In this context, it suggests that there is a negative mentality or attitude that is pervasive in the collective mindset of a nation, and the speaker believes it should be eradicated.