What is Morse Code? How was it used in the 19th Century? How does it compare to technology today? Objective 1) The students will analyze the impact of the transatlantic telegraph on worldwide communications. 2) The students will compare and contrast current technology to that of the 19th century. Background Andrew Johnson National Historic Site offers multiple primary resources to share the story of Andrew Johnson as he rose from a runaway apprentice to a political leader. These resources provide an opportunity for interactive learning in unique historical location. Andrew Johnson, whose life Duration: 90 Minutes.