Washington Territory was a fallout region of the Oregon Treaty of 1846, which saw
the creation, on paper, at least, of
Oregon Territory. Soon after the treaty, settlers north of the
Columbia pushed for a separate territory, which came to pass in the US Congress in 1853, first
on a February bill as “Columbia Territory”, and then amended to “Washington Territory”
in March, in honour of the first US president, George Washington.
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Washington Territory became the state it is today in 1889.2