Erik Homburger Erikson was a German-American psychoanalyst who was most famous for coining the phrase “identity crisis”.
He was also a neo-Freudian psychologist who believes in the Freudian theory and added his own ideas and beliefs. His theory of psychosocial development proposes that all people go through a series of eight stages.
I can confirm the answer is A. federalism
The clause is really a state's rights clause. A state may not pass a law that makes something illegal that was legal before the law was passed. In other words if a state suddenly passed a law that said it is no longer legal to park your car in front of any government building, but it was legal to do so yesterday, the police cannot come to your door and issue a ticket for parking in front of a government building because you did it yesterday.
The constitution actually uses the phrase ex post facto law in Article 1 Section 10 Clause 1.
