Which geographic feature most likely made european colonization of the interior difficult for the spanish in the portuguese

Hi
the answer is Amazon rainforest.

The Amazon Rainforest made colonization in the interior of South America difficult for the Spanish and the Portuguese.

The three steps before modern english were indo-european, germanic, and old english. as peoples moved around the eurasian continent, their languages changed. throughout the ages, the languages became more specialized. as english has many germanic influences, it is easy to see how this was one of the forebears. also, old english was one of the main ancestors of the modern language, spoken in the 5th through about the 13th centuries.