Basically this is a representation of when your ancestors likely arrived assuming you took every American with Irish heritage and traced those lines back to their families arrivals in the USA. Generally speaking ofc and all based on my opinion with use of academic sources.
I’ve done my best here to be as accurate as possible and this is all based on my personal calculations based on several sources such as The US Census, Ancestry and 23andme data sets, and several others.
This is a hypothetical if every single white American traced each line in their entire family tree to the most recent people who either immigrated to the USA or Canada (then to US
I know some white Americans might have minimal Native American or African admixture but I left that out since it’s super uncommon apart from the South mostly.
I’ll post my black American lines next time.