Uncle Sam with Britannia [More Uncle Pictures] This poster shows Uncle Sam arm-in-arm with Britannia, accompanied by a lion and an eagle. It is a dramatic reminder of the long and fruitful alliance between the United States and Great Britain. The poster is titled "Side by side - Britannia! Britain's Day Dec. 7th 1918". The artwork is by James Montgomery Flagg. It was created in 1918 by the American Lithographic Co. N.Y.