The sentence that shows the most bias is:
"What good man would prefer a country covered with forests and ranged by a few thousand savages to our extensive Republic, studded with cities, towns, and prosperous farms . . . ?"
This sentence demonstrates significant bias by characterizing Indigenous people as "savages" and contrasting them in a derogatory way against the idea of an "extensive Republic" filled with civilization and prosperity. The language used reflects a prejudiced view, valuing one way of life (European-American civilization) over another (Indigenous cultures).