The Japanese imperial court system of appointing government officials led to the rise of the Fujiwara family because the Fujiwara family strategically intermarried with emperors and effectively controlled the appointments of government officials, enabling them to consolidate power and influence within the imperial court. Through this process, they were able to accumulate wealth, land, and political authority, solidifying their position as one of the most powerful and influential families in Japan.

The Fujiwara family's rise to power began in the 7th century, when they first entered courtly politics through strategic marriages with members of the imperial family. By marrying their daughters to emperors and princes, the Fujiwara were able to have their descendants ascend to positions of power within the government, giving them unprecedented access to the highest levels of authority.

One key factor that contributed to the Fujiwara family's dominance was their control over the appointment of government officials. The imperial court system required that officials be recommended by powerful nobles, and the Fujiwara used their influence to ensure that their relatives and allies were selected for important positions. As a result, they held sway over key administrative and political offices, allowing them to effectively govern the nation from behind the scenes.

In addition to government appointments, the Fujiwara family leveraged their connections to acquire vast amounts of land and wealth. By marrying into wealthy families and using their political influence to manipulate land transfers, they were able to amass extensive estates throughout Japan. This not only increased their wealth and status but also allowed them to further consolidate their power by controlling crucial economic resources.

Over time, the Fujiwara family became the de facto rulers of Japan, with emperors serving as figureheads while the Fujiwara effectively held the reins of power. Their dominance lasted for centuries, and they played a significant role in shaping the political and cultural landscape of Japan during the Heian period.

In conclusion, the Fujiwara family's rise to power was a result of their shrewd political maneuvering, strategic alliances, and control over government appointments. By leveraging these factors, they were able to ascend to the pinnacle of authority within the imperial court and establish themselves as one of the most influential families in Japanese history.