The acceptance of the Namibian constitution on 9 February 1990 established the Republic of Namibia.  The independence of Namibia can be directly traced to an accord agreed upon by Cuba, Angola and South Africa. The reason that these particular parties were instrumental in Namibia's independence is that Namibia was a protectorate of South Africa from 1920 until 1990. This meant that South African laws applied to Namibia. These included the laws designed to entrench White minority rule.

After years of internal uprisings, which culminated in the Battle of Cuito Carnivale, and dealt a deathblow to the Apartheid regime's habits of engaging in cross border conflict, the parties involved came to an agreement to cease hostilities on the condition that Namibia attained independence.

Namibia's constitution, in its day was seen as most progressive.

Reference:

1. Mathe, A. (unknown) Remembering February 9: A Reflection of the Adoption of the Namibian Constitution from Rhetorica [Online]. Available at: rhetoricafrica.org [accessed 05 February 2010]
2. (2004) Republic of Namibia: Public Administration Country Profile [Online]. Available at: unpan1.un.org [Accessed 05 February 2010]
3. Namibia [Online] at:en.wikipedia.org [accessed 05 February 2010]
4. The Battle of Cuito Carnevale [Online] at: sahistory.org.za [accessed 05 February 2010]