Activism, in a general sense, can be described as involvement in action to bring about change, be it social, political, environmental, or other change. This action is in support of or opposition to one side of a controversial argument.
There are many different forms of activism; a select list follows.
... when they ceded it to Russia. By the Treaty of Portsmouth (U.S.A.) of 1905 the southern part of the island below 50° N was ceded to Japan, the Russians retaining the ...