It was known as the Colombian exchange
Thus the USSR became the first state to have as one objective of its official ideology the elimination of existing religion, and the prevention of future implanting of religious belief, to establish state atheism (gosateizm).
Sociology. the fundamental character or spirit of a culture; the underlying sentiment that informs the beliefs, customs, or practices of a group or society; dominant assumptions of a people or period: In the Greek ethos the individual was highly valued.