In the early 1900s people in many European countries believed that their nation deserved more success than other nations. This kind of thinking is an example of

Eurocentrism

Explanation:

European exceptionalism thus grew out of the Great Divergence of the Early Modern period, due to the combined effects of the Scientific Revolution, the Commercial Revolution, and the rise of colonial empires, the Industrial Revolution and a Second European colonization wave.

European exceptionalism is widely reflected in popular genres of literature, especially literature for young adults (for example, Rudyard Kipling's Kim) and adventure literature in general. Portrayal of European colonialism in such literature has been analysed in terms of Eurocentrism in retrospect, such as presenting idealised and often exaggeratedly masculine Western heroes, who conquered 'savage' peoples in the remaining 'dark spaces' of the globe.

i would say b probably