Aprimary goal of treatment using the cognitive perspective on psychological disorders is to

A primary goal of treatment using the cognitive perspective on psychological disorders is to  explicitly teach new, more adaptive ways of thinking.

The cognitive perspective studies the mind as an information processor and processes like perception, attention, language, memory, thinking, and consciousness.

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.