The Spanish Are Coming
In 1521, the New World was rocked to its core as the Aztec Empire was wiped out by the invading Spanish. The conquerors came for gold, but instead found cacao. The Aztec's great infrastructure for growing cacao now fell into Spanish hands and soon 'xocōlātl' or 'chocolate' began to pour into Europe.
After chocolate arrived in Europe, the innovations came at a much faster pace. Chocolate was an acquired taste because it was so bitter, however, that began to change when sugar was added. Sugar was long established as a popular treat among Europe's elite and its union with chocolate was inevitable. The new sweetened taste also removed the need for strong spices like chilli.
In the late 1600's, milk was used to replace water and finally a drink that we would recognise as hot chocolate was born.