In the 20th century, the United States began to invalidate laws against blasphemy which had been on the books since before the founding of the nation, or prosecutions on that ground, as it was decided that they violated the American Constitution. The First Amendment to the United States Constitution provides that "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press...", and these restrictions were extended to state and local governments in the early 20th century. While there are no federal laws which forbid "religious vilification" or "religious insult" or "hate speech", some states have blasphemy statutes.