The history of why beer contains hops: To avoid taxes.

"In the 16th century, the Catholic Church had a stranglehold on beer production, since it held the monopoly on gruit — the mixture of herbs and botanicals (sweet gale, mug wort, yarrow, ground ivy, heather, rosemary, juniper berries, ginger, cinnamon) used to flavor and preserve beer. Hops, however, were not taxed. Considered undesirable weeds, they grew plentifully and vigorously.

The 12th century German mystic and abbess Hildegard had pronounced that hops were not very good for you, because they 'make the soul of a man sad and weigh down his inner organs.'

The soporific, mellowing effect of hops might seem like a drawback, but in fact it offered a welcome alternative to many of the spices and herbs used by the church that had hallucinogenic and aphrodisiacal properties. "Fueled by these potent concoctions, church ales could be as boisterous as the Germanic drinking bouts church elders once frowned on," writes Bostwick. "And so, to distance themselves further from papal excesses, when Protestants drank beer they preferred it hopped."