B, the war was effectively a stalemate and didn't result in much change except for the rise of Andrew Jackson due to his famous victory
Yes it was illegal. It was considered a violation of the amendments and that's why war was necessary to make people agree on something for once. The Confederate States made their own amendments once they seceded but technically, they never actually left the north so those new amendments were considered null and void.
Hitler used jews as a scapegoat to Germany's economic woes after WWI. Hitler used the conspiracy that jews controlled the banks, gold markets, etc.
The Indian Removal Act took place in the first half of the 1800s under the presidencies of Andrew Jackson and Martin van Buren and directly led to the Trail of Tears, which resulted in the death of many members of tribes in the American South. It was considered controversial because the Supreme Court ruled in favor of the tribes' cause wherein the state of Georgia (which was actively seeking to evict the Indian inhabitants) was told it had no right to force their removal. Nevertheless, the president ordered their removal.
hope this helps! :)