Korea was divided into north and south along the after world war ii.

The correct answer is: the Korean Peninsula was divided along the 38th Parallel after World war II.

Currently the border is moved slightly(rather to the north) and the border is know as the Demarcation line - it's also no longer straight, as it was when it was the 38th parallel.

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years