Manifest Destiny

In 1845, democratic leader and editor John L. O’Sullivan tried to explain America’s enthusiasm for expansion:

 

the right of our manifest destiny to over spread and possess the whole of the continent which Providence has given us for the development of the great experiment of liberty an federaltive development of self government entrusted to us.  It is right such as that of the tree to the space of air and the earth suitable for the full expansion of its principle ad destiny of growht.d