Ergo is sometimes used instead of `therefore' to introduce a clause in which you mention something that is the consequence or logical result of what you have just said. Neither side would have an incentive to start a war. Ergo, peace would reign. = therefore. therefore
(Latin; "I think, therefore I am") Dictum coined in 1637 by René Descartes as a first step in demonstrating the attainability of certain knowledge. It is the only statement to survive the test of his methodic doubt. The statement is indubitable, Descartes argued, because even if an all-powerful demon were to try to deceive him into thinking he exists when he does not, Descartes would have to exist in order to be deceived. Therefore, whenever he thinks, he exists. Furthermore, Descartes maintained, the statement "I am" (sum) expresses an immediate intuition, not the conclusion of a process of reasoning, and is thus indubitable
Post hoc ergo propter hoc, Latin for "after this, therefore because of this", is a logical fallacy (of the questionable cause variety) which assumes or asserts that if one event happens after another, then the first must be the cause of the second. It is often shortened to simply post hoc and is also sometimes referred to as false cause or coincidental correlation. It is subtly different from the fallacy cum hoc ergo propter hoc, in which the chronological ordering of a correlation is insignificant
(Latin) "after this therefore because of this", logical fallacy that simply because one thing happens after another the first event was a cause of the second event