IANAL, but States are not "within the exclusive jurisdiction of the United States"
In this context "the United States" means the federal government. States are also within the jurisdiction of the state government, and therefore not within the exclusive jurisdiction of the United States.
This is the exact same reason why the US president can only pardon federal crimes.
> The term “U.S. Territory” means American Samoa, the Commonwealth of the
Northern Mariana Islands, Guam, the Commonwealth of Puerto Rico, or the
U.S. Virgin Islands.
I'm trying to determine whether or not the language in Title 18 refers to "territory" in the sense of "any land that is part of the United States" (which would include the states), or "organised Territories exclusive of states". It's odd that the language is chosen but not clarified.
I'm aware that generally states have jurisdiction within their own boundaries, but that interstate commerce is an exception. Given railroads' history ... the distinction, contenxt, and intent seem needlessly vague.
Your original point remains though it's not clear to me it's the correct interpretation.
In this context "the United States" means the federal government. States are also within the jurisdiction of the state government, and therefore not within the exclusive jurisdiction of the United States.
This is the exact same reason why the US president can only pardon federal crimes.