Operation Paperclip saw around 1,600 Nazi scientists recruited by US intelligence to aid American innovation. As a result, none were ever held accountable for their crimes.

Puerto Rico is part of the US, governed by federal law but unable to vote in Presidential elections.. So why does it remain in constitutional limbo?

Did you know that the US Constitution's most important amendments took place over just 5 years? So what happened between 1865 and 1870 – and how did it change America?