post hoc ergo propter hoc
(Latin, after this, so because of this) The fallacy of arguing that because one event happened after another, it happened because of it.
Commercial Policy Reference library
Capie Forrest, D. Dye Alan, and Tilly Richard
The Oxford Encyclopedia of Economic History
...suggest that the Zollverein embodied both of the customs union effects mentioned above. More than sixty years ago, however, the economic historian, Sir John Clapham , warned that the Zollverein 's alleged contribution to industrialization was subject to the fallacy post hoc ergo propter hoc . More recent research has confirmed Clapham's scepticism: the foundations of German industrialization were being laid well before the Zollverein was born; and the factors driving that industrialization—the application of new, imported technologies, the accumulation of...