When did they start making dollar coins?

Can you tell me, when did the production of dollar coins first commence? I'm curious to know the historical background and timeline associated with the minting of these coins. Were they introduced as a response to a particular economic need or as a means of facilitating trade? Furthermore, were there any notable changes or innovations in their design and production over the years? I'm eager to learn more about this fascinating aspect of numismatics and currency history.