1. 1843: The Oregon Trail begins in Clackamas County. 2. 1845: The first post office in Clackamas County is established in Oregon City. 3. 1848: The first sawmill in Clackamas County is built in Oregon City. 4. 1851: The first bridge in Clackamas County is built over the Willamette River. 5. 1853: The first school in Clackamas County is established in Oregon City. 6. 1859: The first newspaper i...
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