How to use "portion" in a sentence

Before entering upon so grave a matter as the destruction of our national fabric, with all its benefits, its memories, and its hopes, would it not be wise to ascertain precisely why we do it? Will you hazard so desperate a step while there is any possibility that any portion of the ills you fly from have no real existence? Will you, while the certain ills you fly to are greater than all the real ones you fly from - will you risk the commission of so fearful a mistake?

For instance, why may not any portion of a new confederacy a year or two hence arbitrarily secede again, precisely as portions of the present Union now claim to secede from it? All who cherish disunion sentiments are now being educated to the exact temper of doing this."

On Sunrise Mountain most of the big, expensive houses featured natural landscaping - which meant rocks, colored stones, and artfully arranged cacti instead of grass, shrubs, and trees - in acknowledgment that man's grip on this portion of the desert was new and perhaps tenuous