identify the act of aggression and year committed by each of the following countries during the 1930's and the
reaction of the league of nations.

japan
italy
germany
spain

Answer and Explanation -

Japan -

Japan agreed to respect the border of China. But in 1937 japan didn't keep up their promise and crossed the borders which resulted in war. Addition to this, Japan was run by military leaders.  

Italy -  

The Second Italo-Ethiopian War, was a war which was fought between October 1935 and February 1937. It is taken as an example of the expansionist policy that characterized the Axis powers and the inefficiency of the League of Nations before the outbreak of World War II.

Germany -

Rome-Berlin Axis , Coalition was formed in 1936 between Italy and Germany. An agreement was formulated by foreign minister of italy. Italy's foreign minister  informally linking the two fascist countries was reached on October 25, 1936.  

Spain-

Firstly the Fascist victory in Spanish Civil War, 1936- 39 was taken as act of aggression. Then in March 1938, Anschluss, or union of Austria and Germany, occurs. After that in September 1938. At Munich Conference, Britain and France cave in to Hitler's demands.

d) post-world war i

the caste system in india is the paradigmatic ethnographic example of caste. it has origins in ancient india, and was transformed by various ruling elites in medieval, early-modern, and modern india, especially the mughal empire and the british raj.it is today the basis of educational and job reservations in india.it consists of two different concepts, varna and jati, which may be regarded as different levels of analysis of this system.

the caste system as it exists today is thought to be the result of developments during the collapse of the mughal era and the british colonial regime in india. the collapse of the mughal era saw the rise of powerful men who associated themselves with kings, priests and ascetics, affirming the regal and martial form of the caste ideal, and it also reshaped many apparently casteless social groups into differentiated caste communities.the british raj furthered this development, making rigid caste organisation a central mechanism of administration

i didn’t fully understand your question but i hope this you !