What was the first movie to make over a billion dollars?

Movies entertain us. They inspire us. They allow human creativity to reach new, unforeseen heights.

And they make a small group of people super rich.

While it seems like anyone can basically sneeze out some CGI and rake in oodles of cash these days, someone had to be the first bold explorer to break the barrier.

Which movie was the first to break the billion-dollar threshold?

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