Oregon was inhabited by many indigenous tribes before European traders, explorers, and settlers arrived. Many missionaries would follow the early explorers and traders. European accounts by trappers, traders, explorers, and missionaries give important evidence of early contact culture. Occupations preferred&colon; Rangers, lumberjacks, northwoodsmen, hunters, prospectors, explorers and game wardens. Early European explorers and settlers of North America reported exceptionally severe winters. Firearms were used to protect explorers and settlers from Aboriginal attack. Explorers and missionaries like David Livingstone became national heroes. The North Sea rovers were traders, colonisers, explorers, and plunderers. That is where they encountered European explorers and traders. He inspired abolitionists of the slave trade, explorers, and missionaries. These were the groups that the first European explorers of the area encountered. The first records of the spring are from early European explorers and surveyors. He was undoubtedly one of the greatest natural history explorers of the 19th century. The first Arctic explorers were men with sled dogs. The main cause was infectious diseases carried by European explorers and traders.