Answer:
There are more people of Native American descent in Bolivia than in Argentina due to the fact that Bolivia has been inhabited by a variety of Native American cultures for centuries, while Argentina is a relatively new addition to the region. In addition, Bolivia's population is more diverse, with more than 30 different Native American cultures represented, while Argentina is more homogenous. Furthermore, Bolivia has a higher proportion of its population that is of Native American descent, with an estimated 40% of Bolivians having some form of Native American ancestry, compared to just 5% in Argentina. This is likely due to the fact that Bolivia has had a long history of protecting and preserving its indigenous cultures and traditions, while Argentina has had a much more turbulent history with regard to Native American rights and recognition.