Why isn’t the numbers system the same in US and Europe?

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Europe (mentioned on the left side) = US (mentioned on the right side)

Million = Million

But then Europe has “milliard”, which the US doesn’t. So it continues:

Milliard = Billion

Billion = Trillion

Why and how did this difference occur?

In: Mathematics

Isn’t that the French way of saying it, not the European way? Milliard essentially means one thousand millions, which is equal to a billion.

Milliard uses to mean Billion in English, but it changed over time as language does, so in England, Billion = Milliard but in US Billion = Trillion

There are two ways to do big numbers: Long scale and short scale https://en.wikipedia.org/wiki/Long_and_short_scale

See this table for comparison: https://en.wikipedia.org/wiki/Long_and_short_scale#Comparison