Compatibility summary
You will need a travel adapter in United States; plug types used there differ from Brazil.
Plug comparison
Brazil plug types: C N
United States plug types: A B
There is no common plug type between Brazil (C N) and United States (A B). You need a travel adapter.
Voltage comparison
Brazil: 127V, 60Hz
United States: 120V, 60Hz
Voltage difference is within a range many devices tolerate; check your appliance label.