Per 
Item #: SCP-4000
Object Class: Safe
Special Containment Protocols: SCP-4000-A and SCP-4000-B are to be contained in standard minimum-security storage units on Site 86. All instances of SCP-4000-C are to be destroyed immediately.
Field agents embedded in the text book publishing industry especially are to keep an eye out for new instances of SCP-4000-C and to prevent them from being published or distributed when possible. Likewise, Foundation web crawlers are to routinely monitor publishing and text book piracy websites for digital copies of SCP-4000-C. MTF Unit Mu-451 (“The Firemen”) are to quarantine anyone determined to have produced, distributed, or read SCP-4000-C and administer SCP-4000-A and SCP-4000-B as necessary. SCP-4000-A is to be updated on a yearly basis to match popular curricula where applicable, and SCP-4000-B is to be updated to reflect the contents of SCP-4000-C.
Description: SCP-4000 is the collective designation for a set of cognitohazardous study materials designed to alter the user’s understanding of American history. SCP-4000-A and SCP-4000-C are textbooks written for various grade levels, each classification depicting radically different histories. SCP-4000-C in particular depicts a history in which European settlers integrated completely into Native American society sometime after winning independence from their parent countries rather than forming their own countries and expanding Westward. Several major events happen concurrently with major events as they are currently understood, but under different contexts. For instance, instead of the Civil War between the Northern and Southern half of the United States, there was a great war of unification to combine all the smaller tribal nations into one, continent-spanning country.
Anyone reading SCP-4000-A or SCP-4000-C will become convinced that the history depicted within is factual, disregarding all contradictory knowledge of US history and reframing all else into the context of the new history. Many U.S., Canadian, and Mexican citizens in particular who read SCP-4000-C will come to believe they are members of various Native American tribes, many of which do not exist today, with their earliest immigrant ancestors assimilating into them. Teachers caught with instances of SCP-4000-C have had plans to arrange family field trips believed to be intended to indoctrinate the parents of students to the new history.
SCP-4000-B is a written exam designed as an amnestic that removes the historical knowledge as depicted in SCP-4000-C. Reading each question removes the answer from the reader’s short-term memory, preventing them from coherently answering the question. The more they think about the question, the more relevant information is erased and prevented from re-entering long-term memory. By the end of the exam, the reader is left uncertain as to whether or not they simply imagined the history in SCP-4000-C. An hour later, they will have forgotten having taken the test completely.
An unfortunate side-effect of SCP-4000-B is that it doesn't discriminate between memories and simply prevents whatever is in short-term memory from entering long-term memory. The questions on the exam merely prompt memories to be loaded into short-term memory. Otherwise there is nothing to prevent the user from thinking about, for instance, what they're going to make for dinner that night and forgetting entire recipes. In extreme cases, some have lost a lifetime's worth of memories due to not being able to focus on the exam. As the effects on short-term memory last longer than the test itself, users may need to be monitored and distracted for about one hour afterward to reduce the chances of unnecessary memory erasure.
SCP-4000-A depicts the history of the United States of America, Canada, and Mexico as it is currently understood. Its anomalous properties manifest most prominently in subjects with historical knowledge as depicted in SCP-4000-C or have had knowledge removed via SPC-4000-B. It's effects on citizens of those countries vary depending on their knowledge of history, but are considered negligible and easily corrected through normal social and cultural pressures.
When read by citizens of other countries, SCP-4000-A and SCP-4000-C effects range from intense jealousy and animosity towards the cultures depicted therein to nearly fetishistic obsession. Most typically come to believe America is the greatest country on Earth (regardless of whether they've read SCP-4000-A or SCP-4000-C) and possess a strong desire to visit at least once.
