Extremely new to chess. Why did this game turn into a stalemate

In chess, when there is only a white king, a white pawn, and a black king, and the white pawn becomes a bishop and gives a check to the black king, is

Stalemate: the long and the Short of it

Solutions mindset: checkmate or stalemate? - Shirley Collier

Stalemate in Chess: Rules, Tips and Examples - The School Of Rook

Why does stalemate exist in chess? It's a complete victory which results in a draw, so why haven't people just removed this pointless rule? - Quora

All You Need to Know About Check, Checkmate and Stalemate

New to Chess. Why is this a stalemate instead of a checkmate? I can still move. Why can't I attack? : r/chess

Chess: What are the most effective techniques to force a stalemate? - Quora

Chess Stalemate – How to avoid Stalemate? –

Stalemate To Checkmate: After 12 Draws, World Chess Championship Will Speed Up

In Chess, A Stalemate Isn't a Win. Why?, by Johnny Silvercloud, The Analytical Lens

CHESS] How is this a stalemate? - Community - SitePoint Forums