It is our last free frontier.
4 seconds sound clip from the The Oklahoma Kid (1939) movie soundboard.
You can hear this line at 00:01:20 in the DVD version of the movie.
Quote context
[...]
- Gentlemen, I'm at your service.
- Mr. Cleveland, we'd like to know what you're going to do about the Indian appropriations bill.
- Because I felt the terms were unfair to the Indians.
- The Cherokee strip contains 6 million acres of the finest farming land in America.
- It is our last free frontier.
- It's 180 miles long and 50 miles wide,
- But both houses have now approved the measure...
- That's it, boys. They pay off the injuns, and we move in!
[...]