He had a plan for Reconstruction very similar to Lincoln's. Johnson was impeached because the Republicans thought his plan made it too easy for the Confederate states to get back in the Union.
Andrew Johnson
He was not at all connected to the murderers, but the plot to kill Lincoln also included the killing of Andrew Johnson, but the man who was supposed to kill Johnson had second thoughts and did not carry out his assignment.
a water gun
He carried letters and speeches in it.
Illinois
Abraham Lincoln (1860)
Abraham Lincoln
Andrew Johnson his Vice President did, but his political problems got in the way much of the time. Grant carried out the policies that Lincoln started.
Abraham Lincoln was a Northern Republican, while his Vice President, Andrew Johnson, was a Southern Democrat. John Adams had Thomas Jefferson, a political opponent, as his vice-president. Andrew Jackson "inherited" John C. Calhoun who had been VP for John Quincy Adams, as his vice-president. Although Calhoun helped Jackson carry the South he was not really in Jackson's Party.
No, no US Vice president has ever been assassinated. The men responsible for killing four Presidents were in effect acting against the individual for some perceived offense or policy. Vice Presidents are often in more dangerous locations, but so far none have become victims.
There is no such coin. Look at your Lincoln CENTS to see a picture of Abraham Lincoln. Halves minted in 1963 carry a portrait of Ben Franklin. They're worth about $6.
"Penney" is a department store. I'm sure you mean PENNY, and the reason they're called Lincoln cents is (drum roll, please ...) they carry a picture of Abraham Lincoln.