Conversation so far:
What can you tell me about  Atlantic City casinos?
In 1976, New Jersey voters legalized casino gambling in Atlantic City. The first casino opened two years later.
Was Donald Trump in New Jersey when casino gambling was legalized?
why did Donald Trump decide to go to Atlantic City?
In 1984, Donald Trump opened Harrah's at Trump Plaza hotel and casino in Atlantic City, New Jersey with financing from the Holiday Corporation, who also managed the operation.

Question: what did he do once he got there?
Self-contained rewrite: what did Donald Trump do once get to to Atlantic City ?