Enjoy Sioux City Birch Beer (6x4Pack). Sioux City bottled sodas were developed in 1987 and were one of the first western-themed soft drink brands in the country. Birch Beer is a soda with low carbonation and a rich minty aftertaste with undertones of earthy spice. Sweetened with cane sugar. Note: description is informational only. Please refer to ingredients on the product before use. Please address any health or dietary questions to your health professional before using this item.