Did the Freedmen also get US citizenship?
Yes, of course.
Have they been governed by tax law as it pertains to Native Americans?
Yes.
I understand that the treaty designating the former slaves as included in the Cherokee Nation was imposed upon the Cherokee by duress...
No, it was probably not. It was in 1839, I believe, if you want to do some research.
Is the Cherokee Nation saying that there was no "intermarriage"?
No, but there are some> people who simply moved onto the Indian lands because of the various benefits. Now that Indian gaming is providing the Cherokee Nation with 22 billion dollars a year, that number quickly grows.
Is the Cherokee Nation saying that there was no "intermarriage"?
No, but I believe there is a "one fourth blood" standard to get full bebefits, such as living free on tribal lands.[PDQ--you really need to close italics with the 2nd 'i' - like this </i>- otherwise it won't work]
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