July 17, 1973 is one of the most important days in the whole novel and the history of Afghanistan.
On July 17, 1973, Amir heard gunfire taking place outside and for the first time, he saw fear on his father's face. He knew that something significant was happening. It was the beginning of a revolution on a national level. On a personal level, this day was to marking a turning in his life and the life of his family.
From a historical perspective, the events of July 17, 1973 marked the the beginning of the rise of communist power. This action was to get rid of the monarchy and ushered in a republic in the span of a night! On July 17, 1973, while the king (King Zahir Shah) was on vacation, Mohammad Daoud Khan seized power. Eventually this give rise to the influence of the Soviet Union. These actions would change Afghanistan forever.