This History of the Presidents of the United States user interest template has two userbox options as shown below:

Wikitext Userbox Default Category
{{User interest US Presidents}}
This user is interested in the
History of the presidents of the United States.
Category:Wikipedians interested in presidents of the United States
{{User interest US Presidents|0}} no userbox Category:Wikipedians interested in presidents of the United States

Place the appropriate Wikitext on your user page, and this template will display the userbox shown above and add your user page to the category indicated.

See also

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