Kwaanza is an African-American celebration initiated by Dr. Karenga as both a way to celebrate the new year and a reminder of the history of black communities in the United States. It is based on the agricultural celebrations of Africa called "the first fruits" celebrations which were times of harvest, ingathering, reverence, commemoration, recommitment, and celebration. Kwanzaa is a time of ingathering of African Americans for celebration of their heritage and their achievements, commemoration of the past, recommitment to cultural ideals and celebration of the good. To achieve this Kwanzaa focuses on fundamental collective values rooted in African culture and reflected in the best practices of African American people. The celebration has also become an opportunity for most African-American communities to teach younger generations about African culture, rituals and language. Kiswahili is the privileged language for the seven-day festivities.