The symbol for Jehova's witnesses was a purple triangle.
This symbol was actually also used for other religious minorities, such as Adventists and Baptists, and all other smaller Christian groups.
The background for this specific prosecution was that the Jehova's witnesses refused to salute Hitler.
Number 1 I know is correct
In 1942, Christopher Columbus landed in the Caribbean, unlocking what Europeans quickly came to call the “New World”. Columbus “found” a land with around two million inhabitants. He thought he had found a new route to the East, so he mistakenly called these people “Indians”.
People learn from there mistakes! So every mistake they made back then, they changed based on that mistake, they then passed that knowledge on to their kids, who then made their mistakes etc...