Because most advanced and developing countries have adopted it. It is simple to use.
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Adopting the metric system would align Singapore with the global standard, making it easier to communicate internationally. It would also simplify trade and promote consistency in measurements across different industries. Additionally, the metric system is based on powers of 10, making conversions and calculations more straightforward than the current system.
Canada officially adopted the metric system in 1970 through the Metric Conversion Act. This marked the country's transition from imperial units to metric units for measurements.
The U.S. first opposed the metric system in the 19th century when Congress passed the Metric Act of 1866, which allowed but did not require the use of the metric system. Since then, the U.S. has been slow to fully adopt the metric system for everyday use, despite efforts to encourage its use in certain industries.
In the United States, the decision to adopt the metric system was made by the federal government with the passage of the Metric Conversion Act in 1975. This act declared the metric system as the preferred system of weights and measures for United States trade and commerce.
The North German Confederation adopted the metric system in 1868 and the remaining states in 1875 (after unification). In some of the German states the metric and pre-metric systems were both in use before 1868 - and after 1875. I have an old German ruler which is metric on one edge and give Rhenish inches on the other edge.
The United States is the only industrialized nation in the world that does not use the metric system of measurement as its primary system. The country mainly relies on the customary system based on inches, feet, pounds, and gallons for measurements.