When Jefferson sent Lewis & Clark on their 1804 expedition across the American West, they all still very much believed in the potential of encountering living mammoths. This was because, at the time, people still refused that God would ever let anything go extinct.
In 1700s, the deer skin was a common medium of exchange between the trading settlers and the native Red Indians in America. This is how a buck became a slang for a dollar.
William Whipple freed his slave when he signed the Declaration of Independence, because he believed that he could not fight for freedom and own slaves.