The Nazi-Party was one of the many right-wing extremist political groups in Germany. In 1932, the Nazi-Party became the largest party in parliament. As a result of the popularity, German president Paul von Hindenburg appointed Hitler chancellor, which paved way for Nazi dictatorship after Hindenburg's death in 1934.
When Upton Sinclair said, “I aimed at the public's heart, and by accident I hit it in the stomach,” he likely meant that his novel The Jungle made people more outraged about the meat they were eating than the injustices facing the typical meat industry employee.
The development of immigration.
I think it's C.
The president is the head of the executive branch, which makes laws official and enforces all laws passed by the legislative branch.