1. 1845: The Oregon Treaty is signed, establishing the Oregon Territory. 2. 1848: The first American settlers arrive in the Oregon Territory. 3. 1851: The first Washington County Courthouse is built in Hillsboro. 4. 1853: The first public school in Washington County is established in Hillsboro. 5. 1854: The first post office in Washington County is established in Hillsboro. 6. 1856: The first n...
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