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Oregon is home to the largest living organism in the world, the Armillaria ostoyae fungus. The fungus covers over 2,200 acres of forest and is estimated to be over 2,400 years old.
Multnomah County, located in the state of Oregon, has a diverse and fascinating history that dates back thousands of years. The region's first inhabitants were Native American tribes, predominantly the Multnomah and Clackamas people, who relied on the fertile natural resources of the area for their sustenance.

The arrival of European explorers in the late 18th century marked the beginning of significant changes for the region. In 1806, explorers Meriwether Lewis and William Clark journeyed through the area while on their famous expedition. However, it was not until the mid-19th century that permanent European settlement began. In 1843, a group of pioneers led by William Overton and Asa Lovejoy established the settlement of "Stumptown" on the banks of the Willamette River, which would later become Portland, the county seat of Multnomah County.

As Portland grew, Multnomah County was officially established in 1854, named after the Native American tribe that had originally inhabited the area. The county quickly became a hub of economic activity, predominantly due to its strategic location and accessibility to the Pacific Ocean via the Columbia River. Rapid industrialization followed, fueled by the timber, shipping, and manufacturing sectors that thrived in the late 19th and early 20th centuries.

Throughout its history, Multnomah County has also been shaped by significant social and cultural movements. In the late 19th century, Portland became known as a progressive city, advocating for women's suffrage, environmental conservation, and workers' rights. The county was also deeply impacted by the forced removal of Native American tribes due to the Indian Removal Act of 1830, leading to significant changes in the region's demographics and culture.

Today, Multnomah County remains a vibrant and dynamic part of Oregon. It is home to a diverse population and continues to be an important economic and cultural center in the Pacific Northwest. The county's rich history, from its Native American roots to its prominent role in the development of the region, contributes to its unique identity and ongoing growth.

This timeline provides a glimpse into the major events and milestones that have shaped the history of Multnomah County, Oregon.

  • 1854 - Multnomah County is officially created on December 22, 1854.
  • 1855 - East Portland is established as a separate city from Portland.
  • 1874 - The city of East Portland is annexed by Portland, merging the two cities together.
  • 1914 - The historic Burnside Bridge in Portland is completed, connecting downtown Portland with the Eastside.
  • 1950 - The population of Multnomah County reaches over 400,000.
  • 1975 - The Oregon Convention Center is opened in Portland.
  • 1986 - The first light rail line, MAX Blue Line, begins operating in Multnomah County.
  • 2014 - The Sellwood Bridge, a major transportation artery in the county, is replaced by a new bridge.
  • 2017 - The Multnomah County Library system celebrates its 150th anniversary.
  • 2019 - The population of Multnomah County exceeds 800,000.