Below are a group of sentences which are jumbled up. The first and the last sentences are given and cannot be changed. Sentences 1 and 7 are missing a vital part which has to be searched from sentences A,B, C, D and E. Then rearrange the sentences in their correct order and answer the questions given below.

1. Fifty years after the end of the Civil War, the United State’s _______________________________.

A. But the start of World War I in the summer of 1914 opened up new opportunities and changed American life and culture forever.

B. The war was the start of the “Great Migration,” of more than 7 million African-Americans over the next half-century.

C. Back then, 90% of African Americans lived in the South, most trapped in low-wage occupations, their daily lives shaped by restrictive laws and threats of violence.

D. 9.8 million African Americans held a tenuous place in society.

E. African Americans moved out of the South, most of them heading for the cities.

7. During the World War I period, an estimated 500,000  ________________________