Ranking of the largest 25 gains or losses of the succession cluster per involved war (in ascending order) in terms of area difference between the start and end of the event.

Cluster is a categorization that includes all iterations of a nation and all the possessions of this nation. Example: the cluster spain includes the iterations of that nation, like the Kingdom of Spain and the First Spanish Republic, whereas possessions of spain include Spanish America and the Spanish Philippines. Succession clusters do only include all the iteration of a nation without its possessions (colonies, protectorates, etc).

An event (sometimes simply called war) is a categorization that encompasses changes, revolts, and other significant occurrences. Phersu Atlas includes all historical wars that involved changes or revolts, as well as a small percentage of non-war events (1% of the total), such as coastline changes and peace treaties.