Why is most of the statistical information in the Factbook given in metric units, rather than the units standard to US measure?
US Federal agencies are required by the Metric Conversion Act of 1975 (Public Law 94-168) and by Executive Order 12770 of July 1991 to use the International System of Units, commonly referred to as the metric system or SI. In addition, the metric system is used by over 95 percent of the world’s population.