The Universal Commercial Code requires some terms be "conspicuous" in transactions, and says you can satisfy that requirement with all caps text of equal or greater size than the nearby text. There are some other options, like changing color or alternate fonts, but those are generally just more complicated.[0]
An example of a contract term that must be conspicuous is selling something "as is," ie, claiming no warranty that the thing even works at all.[1]
A note on Universal Codes - nonprofits, usually mostly made up of lawyers, will write model codes for state laws and then try to get them passed in each state so that state laws are predictable. Almost all states have adopted some provisions from the UCC, but several states have adopted modified versions or old revisions.[2]
[0] https://www.law.cornell.edu/ucc/1/1-201
[1] https://www.law.cornell.edu/ucc/2/article2
[2]https://en.wikipedia.org/wiki/Uniform_Act