Where did the idea of manifest destiny come from and why?

It began in the 19th Century.  It means that the Americans believe that it was their destiny to expand themselves throughout the American continent.  As the U.S. gained more land, they moved in and established settlements and eventually gained statehood.  Later they also used this when they began a campaign of imperialism.

i heard they are taking it off i hope this isn't true but otherwise if it doesn't get taken off it will probably be in early december or early january of 2018-2019

the use of electrical signals that transit messages is know as