<span>Assuming that this is referring to the same list of options that was posted before with this question, <span>the correct response would be the "rise in opposition over slavery," since this was what separated the Republicans from the Whigs. </span></span>
What is described is a political machine.
The Boss of a political machine is responsible for overseeing the operation and ensuring that his assistants are giving out the proper jobs and greasing the machine to ensure that people continue to take part in it.
The map is pointing to the middle colonies, but the middle colonies consisted of PA, NJ, Delaware etc, but the arrow is specifically on New Jersey so I would assume New Jersey.
The radical republicans with open arms invited Johnson but after they realized he was gonna follow in lincolns footsteps they turned on him. They mad it as hard as it could be to pass anything and they were going to have him impeached but he didn't get impeached because of one vote