American tourists are being warned to exercise caution in a Latin American country, with a “do not travel” warning issued for one of its provinces. The State Department on April 28 updated its Level 2 travel advisory for Bolivia , urging Americans to “exercise increased caution.” A South American country bordering Brazil , Argentina, Peru, Chile and Paraguay, Bolivia is known for its jungles, salt flats and Andean landscapes. The country draws tourists to its administrative capital, La Paz, as