Traditionally, Eurocentric historians have focused on the works of European philosophers instead of African philosophers because of their

Biasedness

Explanation:

To be Eurocentric historians implies that such historians favor historical perspectives and evidence that support the superiority, supremacy, and domination of European thoughts, values, and cultures over non-Europeans histories. This position is often influenced by Bias, Prejudice, or Partiality.

Hence, Traditionally, Eurocentric historians have focused on the works of European philosophers instead of African philosophers because of their BIASEDNESS