In the late 1830s and early 1840s, using decorated trees on Christmas was already a tradition in Germany, although not really yet widespread.
This all changed after the marriage of the German Prince Albert with the British Queen Victoria. Albert brought his German tradition to the British royal household and the wealthier families soon caught on. Once there was an article in “The Illustrated London News” in 1848, the trend exploded. Everyone wanted to have a Christmas tree.
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Photo Credits / Sources:
Osborne House Christmas Tree illus. in Godey’s Lady’s Book” December 1850 [Public domain] Via Wikimedia Commons.