Still thinking about Lewis and Clark. They were on a mission to find the fabled Northwest Passage to the Pacific Ocean, starting with locating the headwaters of the Missouri River. After months of travel, naming rivers as they go, they came to a spot where the river split into three. It seems to me they could have determined one of those rivers to be a continuation of the Missouri and named the other two. Instead, they decided that the Headwaters of the Missouri was the confluence of these three different rivers. What are the chances they stood there at that aquatic intersection discussing their options and said “I’m feeling a little tired of following the Missouri, how about you? What do you say we just name all three as different rivers, declare their confluence the headwaters, call it a day, and move on!”