You might need a visa
To enter Bolivia, American citizens must have a visa, which can be obtained upon arrival. A return itinerary, hotel arrangements, passport-size pictures, a letter of invitation, evidence of yellow fever vaccination, proof of adequate finances (credit card or bank statement), and US $160 in cash are all required by the government. In actuality, immigration officers normally only collect your money and a snapshot of your passport before waving you through.
The Bolivian government enacted Supreme Decree 4460 on February 2, 2021, reinstating the necessity for U.S. residents visiting Bolivia to get a tourist visa. All U.S. citizens visiting Bolivia will need to get a tourist visa starting February 8, 2021. Bolivian tourist visas are available for purchase at any land or air border. Furthermore, a tourist visa can be obtained at a Bolivian consulate in the United States or another adjacent country. The permit is valid for 30 days. Citizens of the United States who seek to prolong their stay can do so through the Administración Nacional de Migración (National Migration Service), which has offices in nearly every major city. Please see the section below for details on visa requirements.
