Answer:
Nazis were outright extremists. What set them apart from the other extremist parties at the time was hitler's language and volume of his speech.
Explanation:
Hitler was known as a hotheaded politician since he was quick to anger and swore a lot during his speeches. The Nazi parties' popularity grew and grew to the point where you could only choose from the communists and the nazis. Since the communists were already feared (because of the red scare) many turned to the nazis
One example would be economic opportunities. The possibility of a better job would pull someone to a new country. Hope that helps!
World War I completely changed the way wars were fought.
Trench warfare, which was the norm just a century ago was seen as an nonviable strategy.
Modern machines such as tanks and airplanes made trench warfare mostly about keeping ground and resulted in stalemates.
Also, it was the first time that modern tanks, planes and machine guns were being used for first time at such a large scale, resulting in an unprecedented level of death and carnage.
Military generals soon realized that time-honored military code of conducts were now obsolete and a completely new form of strategy was now required.
The answer is B purely due to this statement:
"secures the blessings of liberty" which is in the preamble. Also because it is defined as a natural right. Hope this helps and let me know if you need more help!