Where did the wine slushie come from?

The white wine slushie has its origins in Europe, particularly Germany and Austria.  https://bikramyogauk.net/?p=397 It is believed that the Germans were the very first to add fruit to their red wine, which created a refreshing and special  taste. The Austrians then took this concept and refined it by including ice and other active ingredients to develop the wine slushie we understand and love today. https://geogenes.org/?p=405her explanation