Challenges the Plains Indians faced included hot summers, extremely cold winters, dry conditions with little surface water, and lightning flashes that could cause great fires
Crazy Horse's thinking was that the youngest son always tries to impress his brothers and sisters and so the 'last child' would be the bravest and most daring
Traders and fur-trappers had been travelling to Oregon (on the USA's Pacific coast) for many years and they passed back news of the rich farming land west of the Rocky Mountains
By 1869, when the Oregon Trail was replaced as the main way of travelling west by the First Transcontinental Railroad, 400,000 people had migrated along the Oregon Trail