Which came first, big number notation with commas or fullstops?

In the US, a thousand is written 1,000
Other places (just Europe?) it is written 1.000

Which came first? What did King George and George Washington use? Did it already differ at that time?

AFAIK the convention using a comma to separate “thousands”, and a full stop to mark the decimal point is common to most English speaking countries.

It is interesting that both systems seem to be associated with
John Napier, this cite credits “A History of Mathematics” by Carl B. Boyer as the source.