Why was the Lewis and Clark expendition launched?

Why was life on the great plains so difficult for settlers? Why is the eagle upside down on the 1887 silver dollar? What year did the US stop printing 1000 dollar bills? Which resulted in immigrants being forced to leave areas they settled in? Were the mound builders nomads? What is the value of a 1934 us 1 dollar bill? The first organized Opposition to slavery as an institution emerged in the late what century? Who are the brothers and sisters of Jose Rizal in order? What state did the pilgrims land on Plymouth Rock? Before the 1200s government in England had? What is the value of a 1981 P dime with a silver face and copper back? Why was the 1920s called the age of fords and flappers? What invention probably changed American life the most during the early 20th century? What is the value of an 1881 US silver dollar? In which part of the country is Lincoln Techs campus located? What was the price of a loaf of bread in 1976 in the US? Where is the mintmark on a 1922 Peace dollar? How did the abolitionists fight for the freedom of slaves? Which Indians lived in the Central Valley or the Mountain Region? What is the correct pronunciation of Powhatan?