i'll take it by wikipedia:
The revolutionary wave of 1917–23 saw the active participation of anarchists in varying degrees of protagonism. In the German uprising known as the Bavarian Soviet Republic the anarchists Gustav Landauer, Silvio Gesell and Erich Mühsam had important leadership positions within the revolutionary councilist structures.[99][100] In the Italian events known as the biennio rosso the anarcho-syndicalist trade union Unione Sindacale Italiana "grew to 800,000 members and the influence of the Italian Anarchist Union (20,000 members plus Umanita Nova, its daily paper) grew accordingly...Anarchists were the first to suggest occupying workplaces.
Anarchists *are* in revolutions. it's because for a revolution to become such you need people who hate the government.
but i believe the final notes tend to clear the problem:
Phenomena such as civilization, technology (e.g. within anarcho-primitivism and insurrectionary anarchism), and the democratic process may be sharply criticized within some anarchist tendencies and simultaneously lauded in others.
there are various degrees of anarchism.
thus as there are anarchism by the book:
Anarchism is generally defined as the political philosophy which holds the state to be undesirable, unnecessary, and harmful,[1][2] or alternatively as opposing authority and hierarchical organization in the conduct of human relations
there are certainly "revolutionary" who end up labelled as anarchists for the press.
on the second point, i understand it. Though they "are" in relation. the colons wanted lands which did not actually belong to them, and, if we were to consider the "colonization" of america, using modern laws and legislation, wouldn't it be an outright "invasion" of another country's soil?