<P> The song "At the Hundredth Meridian" by The Tragically Hip is about the 100th meridian west, specifically in Canada, and how it has traditionally been considered "where the great plains begin ." </P> <Table> <Tr> <Td> Preceded by 99th meridian west </Td> <Td> 100th meridian west <P> forms a great circle with </P> <P> 80th meridian east </P> </Td> <Td> Succeeded by 101st meridian west </Td> </Tr> </Table> <Tr> <Td> Preceded by 99th meridian west </Td> <Td> 100th meridian west <P> forms a great circle with </P> <P> 80th meridian east </P> </Td> <Td> Succeeded by 101st meridian west </Td> </Tr> <P> forms a great circle with </P>

What was the significance of the 100th meridian