How many years did Lewis and Clarke explore?

What is a unsorted till? Who introduced the first textile machine to America? When was the security strip put in 100 dollar bills? What was the reaction to the creation of the naval blockade around the southern states? In what ways did a division of labor contribute to the growth of mesopotamia civilization? What trends or events in other countries prompted people to the US in the late 19th and early 20th centuries? How did people from many different countries come the US? Why was Ohio a busy haven for runaway slaves? Why is Andrew Carnegie important to the US? Was an indentured servant free once their time was up? After the Europeans arrived in the Caribbean what caused the deaths of countless Native Americans? Does the US government owe the native Americans anything? What is a American Indian gathering? What is on the back of a 1925 twenty dollar bill? Value of 1951 liberty half dollar? How much is an E Pluribus Unum coin made in 1884 with an S below the eagle and a bit of writing on the front worth? What does the Indian word sigwan mean? What was the relationship between the cotton gin and the growth of slavery in the south? Whats the value of1922 peace silver dollar with In God We Trvst printed on the back? What parts of the Americas were enslaved people taken?

How many years did Lewis and Clarke explore?