Briefly explain the meaning and importance of ""the doctrine of chances or averages"" referred to by wallace.

"The Doctrine of Chances" is a theory that was proposed by Alfred Russell Wallace that related to the theory of natura selection of Darwinists. This doctrine is what we now consider "statistics." Wallace's idea was to use this doctrine of chances and averages in order to study population genetics.

john maynard keynes developed new economic theories in response to the stock market crash of 1929. great depression of the 1930s. first and second world wars. economic boom of the 1950s.

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).