Jesse Plemons is an American actor born in Dallas, Texas. He is of predominantly English descent, with some Scottish, Scots-Irish/Northern Irish, Swiss-German, distant Welsh, and remote Dutch ancestry. He grew up partly in Mart, Texas, and has been involved with acting from an early age.
The phrase "What kind of American are you?" is also a notable line from a film called Civil War (2024), in which Jesse Plemons' character asks this question as part of a tense scene reflecting political divisions in America, but this is related to the character he portrayed, not his personal identity.
So, Jesse Plemons is an American of primarily English ethnic background with a multi-European heritage.