The political spectrum spans from Communism on the extreme left to what on the extreme right?

Apsychologist has developed a series of personality inventories and wants to determine if they are valid. one of the scales measures perfectionism, so he asks a colleague for advice on how to establish the validity of this scale. the colleague tells him that if he were to find a sample of people with personality disorder, these people would obtain high scores on a scale that measures perfectionism.

According to the aztec history, how did the aztecs know where to build their new city of tenochtitlan? why was this a good location?

Do you think the united states experiences amalgamation, assimilation, or pluralism? why?