Controlling for Mexico, mee's definitely correct as VWP entrants are way more than half of all foreign citizens arriving in the US.

Tourists from Brazil, despite the visa headaches, are a a large slice of the non-VWP country incoming foreign tourists -- they have in recent decades been the largest source of foreign tourists to the US of any non-VWP country besides Mexico.

Given both: a) that the US dollar has become the Bush peso and the Brazilian currency has strengthened considerably against the dollar; and b) that something like 99+% of Brazilians who pass financial worthiness tests to get a visa and get it are either from a city or own accomodations in a city with a US consulate or embassy, it is no wonder that Brazilian tourist numbers have held up reasonably well.