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.
... The Portuguese royal family and government fled Portugal from Napoleon in 1807 and relocated to Brazil. Though they returned in 1821, the interlude led to a growing desire ...