By now you know, US citizens do need a tourist visa, costing $100. It is good for multiple entries, but must be used within 90 days of issuance. It could be renewed, in the past, by going to a Policia Federal office and being either ignored or hassled. As I was in Porto Alegre and had a friend in Montevideo, I went visiting and stopped at the Brasil consulate there. They re-issued my visa on the spot, as I had a return air ticket from SP to the States. The visa used to be valid for five years if you wanted to return to Brasil after your initial visit.
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