The thirteenth amendment put an end to what custom found in some parts of the united states?

Who was a leader of the soviet union. a) winston churchill b) fidel castro c) harry truman d) mikhail gorbachev

One day as your professor is driving to work, another driver runs through a red light and hits his car. the professor is shaken up but survives the accident. however, the next time he starts to enter the intersection,he becomes nervous and fearful. soon,he starts going to work via another route to avoid the intersection even though this route adds twenty minutes to his commute in each direction. according to the principles of classical conditioning, why does the professor become scared of the previously harmless intersection? what can he do about this, as going via other route is very time consuming? be specific. break down the situation into its parts and show how the principles of learning apply.

Which of these were effects of mass production techniques used during 1920s