Hitler in his writings, "Mein Kampf" explains his ambitions for Germany. He would create Germany into a ethno-empire. He would conquer Eastern Europe to create, "lebensraum" (Living Space) for the Aryan Race. The Aryan Race is a ancient civilization that Hitler believes are the ancestors of Germans. He explains the Aryan Race is superior to all others, culturally, technologically, physically, mentally, etc. He also shows his deep hatred for the slavic peoples and Jewish population. Anti-Semitism was common at the time and he used the Jews as a scape goat to rally Germany during the Great Depression.
It would be "germs and disease" that had the greatest impact when the Old and New Worlds met, since the Natives in the New World were not immune to the germs that the Europeans were carrying--leading thousands of Natives to be killed.
The objective of the Spring Offensive in March 1918 was to defeat French and British armies on the Western front, which would cause Germany to win total victory if it went as planned