This applies to the United States, where Works published prior to 1978 were copyright protected for a maximum of 75 years.
See Circular 1 "COPYRIGHT BASICS" PDF from the U.S. Copyright Office. Works published before 1923 are now in the public domain and also in countries that figure copyright from the date of death of the artist (post mortem auctoris) in this case 1900, and that most commonly run for a period of 50 to 70 years from that date.
Dred Scott v. Sandford
The Supreme Court decision Dred Scott v. Sandford was issued on March 6, 1857. Delivered by Chief Justice Roger Taney, this opinion declared that slaves were not citizens of the United States and could not sue in Federal courts. In addition, this decision declared that the Missouri Compromise was unconstitutional and that Congress did not have the authority to prohibit slavery in the territories. The Dred Scott decision was overturned by the 13th and 14th Amendments to the Constitution. Primary Documents in American History
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