In 1997 game called age of empires was born. It was one of the first RTS games on the Earth ...
RTS, unit queueing, UI design and other related gameplay elements were widespread long before 1997, even long before Westwood brought it to the masses with their popular hits C & C / Dune. Elements of the user interface were influenced by advances in human-computer-interaction research since the 80s but video-games designers were strubborn and tried to reinvent the wheel that is the user-interface countless times, before giving up and accepting widely spread methodologies. Anyway, this is vastly off-topic and I kept it short.