However , a brief civil war in 1997 ended in the restoration of former Marxist President Denis Sassou Nguesso to power .
After a quarter century of Marxism , Congo became a multi-party democracy in 1992 .
A brief civil war in 1997 ended in the restoration of former Marxism President Denis Sassou Nguesso to power .
After a quarter century of Marxism , Congo became a multi-party democracy in 1992 .