By MARK BANKER
Sometime in my 40 years as a teacher-historian, I envisioned “the five L’s” to help my students grasp and remember these insights.
Land — lots of it, and a vast treasure trove of resources — assured our nation’s material successes and its many spinoffs.
Location. Until recently, two wide oceans and unthreatening neighbors saved most Americans from the physical and emotional scars of invasion.