Final answer:
Geopolitics influenced the origin and development of the Nazi idea of Lebensraum by fueling the ambition for territorial dominance and expansion eastward.
Step-by-step explanation:
The Nazi idea of Lebensraum was influenced by geopolitics. Germany's ambition to expand eastward and the desire for territorial dominance fueled the Nazi ideology. Hitler envisioned German families settling in lands seized from countries in eastern Europe, supplanting the native Slavic populations. This idea of physically and culturally superior Germans reclaiming Europe from inferior Jewish and Slavic peoples was driven by geopolitical expansionism.