text:  Chad is a <unk> country in Africa whose northern region lies within the eastern reaches of the <unk> Desert and whose southern region lies within the eastern portion of the <unk> . It borders Libya to the south , <unk> to the east , Sudan to the west , and the Central African Republic to the north . Chad was originally part of French West Africa until 1960 , when it declared independence . Some four years later , the former French colony made its <unk> at the 1964 Summer Olympics in Tokyo , Japan . For the next three decades , Chad became embroiled in civil war and experienced invasions by Libya and upheavals by Sudanese @-@ backed rebels ; the civil war ended in 1990 , although rebel threats had persisted between then and 2008 . During Chad 's greatest era of instability , athletes from the country did not attend the 1976 Summer Olympics in <unk> , Canada or the 1980 Summer Olympics in Moscow , USSR , although <unk> were sent to all other games between 1964 and 2008 . 
  