-<span>world's longest human made structure at more than four thousand miles actually
</span>-co<span>nstructed from a series of smaller walls that were connected together built
</span><span><span>
-to guard against Mongol invaders</span></span>
A primary source comes from a first-hand witness's point of view which makes the information from that source more valid than a secondary.
Answer:
Read below :)
Explanation:Nazis believed that Germans were biologically superior (<em>Arian race</em>) destined to obtain (<em>Lebensraum</em>).
This encouraged a violent and expansive foreign policy, in pursuit of the land in the East of Europe, where Slavic people habited. The policy was further directed at the Soviet Union at large since it was the natural rival of Germany.
Lebensraum was a concept to justify fierce and quick expansion by all means so that German population would eventually inhabit a "continent" where Aryans would live and develop as they were "genetically entitled" to live in pursuit of an inevitable process of evolution of races.
