The Domino theory (n.) fears not conquest but contagion: success in one poor country will be copied by the next.
The Domino theory (n.) is at bottom a virus theory: the danger is not conquest but an independent example spreading.
The Domino theory (n.) has two versions: the public one, derided as a naive error once it has done its work, and the internal one, never abandoned because it is plausible.
Domino theory (n.) fears not conquest but example: the 'virus' that successful independent development serving the poor might infect others.
Domino theory (n.) is old: the Czar and Metternich feared that republican ideas crossed the seas and toppled orders far from any contact.
The Domino theory (n.) is not foolish when the dominoes fail to fall; it fears the example of independent development spreading like contagion.
Domino theory (n.) speaks privately of rotten apples and viruses: an independent country that might infect others with the idea that social change is possible.