My heritage is American. Genealogy research has informed me that my father's side of the family has a mix of various European roots, most notably Irish (My father's maternal great grandfather), Scottish (Maternal side, dating back to the Revolutionary war), German (My father's paternal great-grandparents) and Welsh (My father's paternal side, dating back to the early 1800's).
On my mother's side, there's almost no genealogical data that can be documented. According to the family, my mother's great grandmother claimed to be half Blackfoot (and the tintype of her at my grandma's house has some very native features). However, since most of the family is illiterate and very poor, with a lot of home births... tracking down anything useful is almost impossible.
A couple interesting things I found though.
My paternal grandmother believed her maiden name was Rhoades, when we found her birth certificate her father's last name was listed as Rood. We found out that my grandmother and all of her siblings had been spelling their last name incorrectly and differently from each other. From that we were able to document the family back to a Scottish lord that was sent to the Colonies during the Revolution as a fighter for the British. He immediately switched sides, changed his name and joined the revolutionaries.
My paternal great great great grandfather was chased out of several towns in Virginia, West Virginia and Ohio for A) Impersonating a travelling preacher, then taking the money and running, B) Stealing horses and C) Selling 'cure-all' medicine.
So my genetics are a mix of turncoats, swindlers and whatever else got tossed out of Europe.