While the exact date is hard to pin down, the process emerged around the 1860s. This coincided with several key factors:
* The California Gold Rush: Increased demand for food in California fueled the development of food preservation techniques, including canning.
* Advances in canning technology: Improved canning methods allowed for the preservation of perishable goods like salmon.
* The development of the salmon industry: As salmon fishing expanded in the Pacific Northwest, there was a need for efficient ways to preserve the catch.
It's important to note that the specific timeline may vary depending on the region and specific cannery.