Hillsboro began as a crossroads for the Native American Atfalati, retired trappers, missionaries, and land-hungry settlers whose collection of farms became East Tualatin Plains. These earliest residents were drawn to the rich valley land between the forested creeks. As the missionary influence waned and the railroads arrived in the 1870s, the town, by then called Hillsborough, was dubbed "Sin City." Farmers and merchants quenched their thirst and gambled in saloons and placed bets on horse races down Main Street. Throughout the early 20th century, Hillsboro became predominantly a...