And it lasted all of, what, a decade? For an extremely small, wealthy elite minority of the population. The vast, vast majority were still rural, and I assure you they didn’t build a national rural system of education and culture in that decade.

1965 - The Afghan Communist Party secretly forms. The group’s principal leaders are Babrak Karmal and Nur Mohammad Taraki.

1973 - Khan overthrows the last king, Mohammed Zahir Shah, in a military coup. Khan’s regime, the People’s Democratic Party of Afghanistan, comes to power. Khan abolishes the monarchy and names himself president. The Republic of Afghanistan is established with firm ties to the USSR.

1975-1977 - Khan proposes a new constitution that grants women rights and works to modernize the largely communist state. He also cracks down on opponents, forcing many suspected of not supporting Khan out of the government.

1978 - Khan is killed in a communist coup. Nur Mohammad Taraki, one of the founding members of the Afghan Communist Party, takes control of the country as president, and Babrak Karmal is named deputy prime minister. They proclaim independence from Soviet influence, and declare their policies to be based on Islamic principles, Afghan nationalism and socioeconomic justice. Taraki signs a friendship treaty with the Soviet Union. But a rivalry between Taraki and Hafizullah Amin, another influential communist leader, leads to fighting between the two sides.

At the same time, conservative Islamic and ethnic leaders who objected to social changes introduced by Khan begin an armed revolt in the countryside. In June, the guerrilla movement Mujahadeen is created to battle the Soviet-backed government.

https://www.pbs.org/newshour/politics/asia-jan-june11-timeline-afghanistan