Portland, OR was named after Portland, the home town of Petty grove, the founder of the city. It is a leading exporter of food grains. It has a lot of high-tech industries and is a tourist attraction. While you test drive the car, there should be no shaking or vibration of the steering wheel. When shaking occurs only on braking the problem could be due to sticking caliper or a warped brake rotor. Vibration could be due to unbalanced tire or a loose steering rack. Any Credit Ok!