Confused on what you mean. Can you elaborate?
Domino Theory is the theory that suggest that once Vietnam becomes communist, that the countries such as Cambodia, Laos, Indonesia, or even India may also fall under the communist regime.
We indeed are using the same techniques on the war against terrorism, seeing as how Afghanistan was once run by a terrorist government/a government whom supported terrorism, we feared that there was a change that Pakistan, or Iran, or Iraq would also fall under these Taliban governments.
The Germans wanted the British government to ignore the Treaty of London and let the German army pass through Belgium. ... In the end, Britain refused to ignore the events of 4 August 1914, when Germany attacked France through Belgium. Within hours, Britain declared war on Germany.