“Nonresident” has a different meaning for federal and state taxes. For federal taxes, a nonresident is someone who does not qualify to be a resident alien.
For state taxes, a nonresident is someone who does not live in the state, usually because they commute to work from another state or live in another state and have Wisconsin income from property or a business, for example. There is no physical presence test or exempt periods.
If you lived in Wisconsin, you would be a part-year resident unless you maintained a permanent domicile elsewhere, e.g. you owned and maintained a house in another country.
The fact that you don’t know where you will end up in the U.S. implies that Wisconsin is your home at present because you have no other home.
See Legal Residence/Domicile which includes a Legal Residence (Domicile) Questionnaire.
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