Skim the Text 1: How Barack Obama Became the First African American, and finish the folloing exercise: 1 What is the pattern of details of this text ? 2 Please divide the text into 3 parts. 3 Try to list the series of historical events that contributed to Barack Obama' s victory (elected as a president). 4 What' s the main idea of the Paragraph 5? 5 Please name the events which setback the progress for Obama to be the president.