Cryptomnesia can occur due to source-monitoring error, where <u><em>unintentional</em></u><u><em> </em></u>plagiarism takes places.
Because of the river gave them advantage to spread and conquer.
Step by step:
Because when we’re introduced to something we aren’t “used too” we tend to judge. An example of this is like people with tattoos are less likely to get a good job just because they’re judged off of the tattoos, not their actual credentials