A concept repudiating endogenous origins of the Piast state has presently enjoyed considerable popularity in Polish historiography and archaeology. The scholars who support this hypothesis propound that the Piast state was formed in an act of conquest by a foreign military elite. Ideas akin to this supposition. based on the so called social conflict theory. https://www.bekindtopets.com/limited-stock-Original-U-S-Vietnam-War-Era-Operation-Igloo-White-Seismic-Sensor-Inert-Rocket-great-price/