 In the 20th century, governments' attempts to educate the whole population in each country was based on a goal of assimilation, or increasing attempts to offer school education to the whole population had the explicit goal of hispanization (castellanización) of the indigenous peoples.Spanish was used as a language of instruction for learner groups although few among more isolated indigenous communities understood it.Students did not have much success in learning, and there were high rates of class repetition or dropouts.