That is why this happened. vs Which is why this happened.

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Looking on the internet deeply has found these results:

That is why this happened. is the most popular phrase on the web. 

Which is why this happened.

1813,000 results on the web

That is why this happened.

11,090,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:
  • Your break
  • We still don't know why this happened.
  • Maybe this is why this happened.
  • Now state lawmakers want answers as to why this happened to him.
  • Letting them know why this happened.
  • And it's not the reason why this happened.
  • But let's not forget why this happened.
  • up isn't why this happened.
  • And it's not the reason why this happened.
  • Maybe this is why this happened.
  • Letting them know why this happened.
  • up isn't why this happened.
  • We still don't know why this happened.
  • Your break
  • Now state lawmakers want answers as to why this happened to him.
  • That is why this happened.

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