The land was free and perfect for farming, if settlers survived the journey to Oregon the land was all theirs. But not only did the US like it, Britain and Russia also liked it. So the US told people to move there ASAP so it would officially be claimed by America.
I believe they had a plane with cameras that tools pictures and they saw in on there
It is A and C.
Hope this helps! Have a good day!
<span>For several years the Angkor or Khmer Empire was the most powerful state on the mainland Southeast Asia. (in 800's) I believe that is your answer.</span>
President Woodrow Wilson
December 23, 1913