Editing Potash (section)

=== 19th century ===
After about 1820, New York replaced New England as the most important source; by 1840 the center was in Ohio. Potash production was always a by-product industry, following from the need to clear land for [[agriculture]].<ref name="digital.library.okstate.edu" />

==== Canada ====
From 1767, potash from wood ashes was exported from Canada. By 1811, 70% of the total 19.6 million lbs of potash imports to Britain came from Canada.<ref name="Paul Warde 2018" /> Exports of potash and pearl ash reached 43,958 barrels in 1865. There were 519 [[Ashery|asheries]] in operation in 1871.