They were all part of the British Empire
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The British Commonwealth is an obsolete name for what is now called the Commonwealth of Nations. It is an association of some 54 independent, sovereign nations, most (but not all) of whom were once part of the British Empire
About a third of the world's countries were involved in the war but the most important ones were Germany, Austria-Hungry, Ottoman Empire, U.S.A, France, Britain, Italy, and Russia. Japan and all of the British Commonwealth/Empire colonies also participated.
Mozambique - once a Portuguese colony - joined the Commonwealth, though it was never part of the British Empire. The point is that most of its neighbours belong to the Commonwealth.There are three other Commonwealth members that were never under British rule: Namibia, Samoa and Rwanda.
You do not specify who "they" is. With few exceptions, Britain and most of the British Empire/Commonwealth countries, British Dependencies and British Overseas Territories would have been using Pounds, Shillings and Pence or something similar 100 years ago. The second half of the 20th Century saw most countries change from change from the archaic currencies they had been using to a more user friendly "decimal" currency, often based on the Dollar of 100 cents or, in the case of Britain, to the Pound of 100 Pence.
depends how you mean, European empire or empire in Europe The british empire was the largest European empire, controlling 1/4 of the world's landmass. The roman empire was the most powerful in Europe, controlling nearly half of Europe