What geographical characteristics determine where cattle trails develop? a. sufficient water c. adequate grazing b. areas of easy access d. all of the above

yellow fever and other tropical diseases

- "bill clinton ( the 42nd u.s. president, served in office from by low unemployment, declining crime rates and a budget surplus. during clinton's second term, the u.s. economy was healthy, unemployment was low and the nation experienced a major technology boom and the rise of the internet."