I'm assuming you mean the book :)
The Giver champions the idea that differences give us life. This is an incredibly important message, because differences are often stifled by society.
Another important idea in the book is the exploration of what would happen if the government took away our knowledge of history. This would drain us of a lot of power.
A. He is thinking about dropping atomic bombs on Japan
Harry Truman ordered that the United States drop two atomic bombs on Hiroshima and Nagasaki in Japan which happened in August of 1945, which led to the end of World War II.
The American Flag has 50 stars to represent the 50 states.
"Agriculture, was followed by job specialization, then by social stratification, and finally by chiefdoms" would be correct, since agriculture allowed people to go off and do other jobs since there was a surplus of food.