In 1900, the British Empire covered a fifth of the land area of the earth. This led to conflict between the major countries of Europe. Great Britain was trying to conquer Africa from Cairo (in the north) to Cape Town (in South Africa). France was trying to conquer Africa from the Atlantic Ocean to the Red Sea. A few years later, Kaiser Wilhelm of Germany wanted colonies in Africa, too. This angered other major countries and increased the tensions that led to World War I. The desire to take over lands for one's own country is called

Imperialism

Explanation:

Increasing hostility between European countries led to the rise of Imperialism with invasion, colonization and annexation of African territory in the mid-1800s Europe indulged in imperialism. European countries began colonizing for three factors, political, economic, and social. The Berlin Conference in 1885 helped the European powers in the colonization of Africa.

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.

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.