Which words are ESL students unlikely to know?

This page shows the preponderance of general academic vocabulary in a typical history text.

The following is an extract from a grade 10 history book. The highlighted words are unlikely to be known by all but a few ESL students. They comprise about 18% of the text, so clearly this would constitute a reading task of considerable difficulty for such students.

There is much more information about the kind of vocabulary illustrated here in the Academic Vocabulary index.

Source textbook: The Heritage of World Civilizations: Volume 2 p627