That's it (That was it).

(1)それだけ。
(2)それで終わった・決まった

1. I found two doctors in the whole city. That was it.

(click here for original context)

2.

Even though I threw the ball well tonight, one player hit a decent ball and it found a hole. That
was it, that was the game. [= With that home-run, they won the game.]

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3. I saw her for the first time that night and that was it. I knew I wanted to marry her.

4.

He went to his first ever rock concert - to see Marc Bolan and T-Rex in concert at the
Liverpool Stadium. That was it. He wanted to play in a band.

(click here for original context)

5. Then he lost control of the car and it crashed into the wall. That was it for Johnson; he was
　 finished with driving.

(click here for original context)