Will a stamp from 2018 affect my ability to enter Thailand with a US passport?

We wish the OP success in planning her Trip to Thailand.

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It looks like more of a note to embassies that you might not be able to get a visa, not a note to immigration that you may be denied entry. But after 4 years it's not really relevant either way.

Long long ago, no worries.

In the USA look at the websites of the Thai Embassy or Consulate which serves your State of residence. Google for their website location

I have placed the TOPICS of interest to you on your post.

CLICK on them and all posts about the topic will pop up to read.

Then refer to your Thai Embassy or Consulate which serves your State in the USA for application information about the Visa you may wish to apply for.

NO need to worry. That was 4 years ago...You are now welcome to travel to Thailand.

Choose the Visa best for your planned visit or stay in Thailand.

A Thai tourist visa gets you 60 days stamp on arrival plus One 30 day extension of stay at Thai immigration office for 1900 Thai baht.

IF you are planning to stay longer, suggest you look at the METV multiple entry tourist visa. With planning it can get you up to 9 months stay in Thailand with a couple simple land border bounces.

Or you can enter Thailand VISA EXEMPT which gets you 45 days stamp on arrival plus One 30 day extension of stay at Thai immigration office for 1900 Thai baht. = 75 day stay in Thailand.

The 45 days Visa Exempt Entry is available thru March 31 2023. From April 1 it's 30 days Visa Exempt Entry.

Both can be extended for 30 days at Thai immigration office.