In b4 “300 million Americans can’t be wrong”. Because “The 6.5 billion others in the world can’t be wrong” is a stronger argument in comparison.

2.54 cm in an inch
12 inches in a foot
3 feet in a yard
1760 yards in a mile

vs.
100 cm in a metre
1000 m in a kilometre

or

16 drams in an ounce
16 ounces in a pound
14 pounds in a stone
112 pounds in a hundredweight
2240 pounds in a ton

vs.

1000 grams in a kilogram
1000 kilograms in a tonne
(or 2.2lbs to the kilogram)

Unsurprisingly, the metric system uses a base 10 cogent argument, because we all have 10 fingers and toes (unless you’re from Norfolk, or the Deep South). The only scale that is generally not considered base 10 or metric derived is time.

(For temperature, the metric Celsius scale separates the melting point of water (0ºC) and the boiling point of water (100ºC) at sea level by 100 degrees. The Fahrenheit system uses 32F and 212F, which is 180 degrees apart (a factor of 60), akin to 360 degrees in a circle or 60 seconds per minute. The few countries to use the Fahrenheit system are the US, Belize, and the UK colloquially when it is hot – they use Celsius when it is cold.)