There are a TON of security features present. You can find a ton of details here:
https://www.uscurrency.gov/sites/default/files/downloadable-materials/files/CEP_Dollars_In_Detail_Brochure_0.pdf
One of the big ones is – They’re not made out of paper. They’re made out of fabric – typically a mix of cotton and linen. That’s a huge barrier for 99.99% of people. For everyone else, there’s everything from strips embedded in the fabric, specialized ink that color shifts, incredibly fine details that are hard to duplicate in the designs, raised printing of ink, etc. Making a convincing fake becomes incredibly difficult.
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