The optimism of the reform era is a period of time when a lot more american citizens started to adopt a progressive way of thinking, which put a heavier emphasis on human right and the general wellness of the people.
This era was catalyzed by the establishment of slavery in 1865. Many books published in this period started to highlight the importance of equal rights for all human regardless of race, gender, social status, or religion
It started to gradually destroyed american way of thinking that a certain group of people was superior to another and promote the idea that no group should be given a special treatment over another group.
B. Hitler's main reason for starting World War II was the following: He wanted to unite the German people He wanted to expand the land of Germany to feed more people (this is why he demanded Danzig from Poland)