when was the ex post facto law created
Ex post facto law After World War II, Finland was under pressure to convict political leaders whom the Allied powers considered responsible for Finnish involvement in the war. An ex post facto law was passed in the autumn of 1945 to permit prosecution for war responsibility, and eventually eight politicians were convicted.
Law of the United States At both the federal and state levels, with the exception of the state of Louisiana, the law of the United States is largely derived from the common law system of English law, which was in force at the time of the American Revolutionary War.[14][15] However, American law has diverged greatly from its English ancestor both in terms of substance and procedure,[16] and has incorporated a number of civil law innovations.