The barebone basics are on the
SA web site:
1920, September 1: A few months after being injured in a failed assassination attempt by members of the Cult Of The Black Goat, Woodrow Wilson forms an elite governmental taskforce codenamed Threshold.Since the game is (as usual with 'Lovecraftian' ones) set in the 'Pulp era' (1920-1930) the 'official' fluff probably covers this period. Yet you are free to invent the background of 'Threshold before Threshold' -there must have been one, since the Great Old Ones and the Outer Gods, with their minions, were here before humankind and raised cults as soon as humans were brainy enough to be manipulated. You can develop it in the synthetic '
Wold Newton' fashion: no IP infringement as long as you publish your ideas only on blogs / forums.
In a similar vein the organization that received (secretly) an official status as
Torchwood (after having used the
Diogenes Club as a cover) may have appeared centuries earlier as an informal network of scholars gathered around
John Dee (known in Lovecraftian circles for his
translation of the Necronomicon), and initially known by its members as '
Bookworm' (because of the time they spent perusing
'many a quaint and curious volume of a forgotten lore'). Later suspected leaders include
Francis Bacon and Isaac Newton (who let leak references to 'our Secret College). Now, Bookworm was basically a club of 'natural philosophers', esotericists and churchmen, most of them neither fit not inclined to 'active field work', so they relied on more adventurous characters (such as, in the mid-18th C., the members of the
2nd League of Extraordinary Gentlemen, better know as the
Lemuel Gulliver Fellowship).
Now 'unusual events' occurred also in the
Colonies: for
the 18th C. alone some are
reported in the literature, most are mentioned only in more obscure sources:
sorcerers came with the White Man, Western witches added their
nefarious deeds to the threat of native changelings, 'devils'
roamed in New Jersey... and some obscure presences there were actually
far more ancient; while zombies-rising Voodoo priests
were coming from the 'sugar islands' and '
privateers' made very
weird encounters in the Caribbean. This led Bookworm to set up a detached branch in the Colonies: the American Revolution momentarily divided it and severed for a time the links between the 'Rebels' and the mother organization; yet the -now independent- 'American' Bookworm survived, and in all likelihood President Wilson used it, or at least its expertise and archives, when he created Threshold.