The country cannot unite, under Trump or otherwise.
The sides are too far apart; the Left is too evil to concede.
When Trump wins, we all know what will happen. The Democrats in Congress will do everything possible to prevent him from governing at all, let alone implementing his platform. The impeachment resolutions will be ready before he is even sworn in. The lawsuits challenging his rightful immunities will be formally presented, in several jurisdictions. Election results will be challenged at every turn.
The Media will remain on Attack Mode for the duration of his Presidency, as will Academe, Hollywood, and the Deep State.
The Republicans have to "run the table*," and even that won't prevent these things from happening, only slow them down.
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* Win the House, the Senate, and the "popular vote."