Samuel Morse's telegraph line between Washington, D.C. and Baltimore was successful.
A synonym is kind, caring, or nice.
Do you remember the saying “I plead the fifth!”? This means that you cannot be charged for the same crime twice, also known as double jeopardy. This is important because it would be unfair to charged double for the same thing you were charged with last time
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One of the most important ones is that by referring to the South as "the rebellion," Lincoln establishes that the North States are the ones adhering to the "Union" and therefore, the United States, while it is the Confederacy which wants to leave.