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Conservationists fear a return to the rapid deforestation in the Amazon rainforest if Flávio Bolsonaro carries the vote on Sunday.
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Campaign towels depicting Mr. Bolsonaro and Mr. Lula in Brasília this week.
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Flávio Bolsonaro during a campaign event this month in Porto Alegre, Brazil.
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President Luiz Inácio Lula da Silva during the launch of his re-election campaign in São Paulo in August. He is seeking a fourth term on Sunday.
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A gathering last month in Nanuque, Brazil, where longtime residents and those who have moved away come together to dance and reconnect.
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A deforested area of the Amazon.
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President Luiz Inácio Lula da Silva in Brasília on Monday. He is taking on a right-wing candidate in a runoff on Oct. 25.
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The presidential candidate Flávio Bolsonaro in Brasília on Sunday.
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Flávio Bolsonaro, the son of Brazil’s former president Jair Bolsonaro, had the lead after Sunday’s vote.
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An effigy of President Trump carrying a depiction of an incarcerated President Luiz Inácio Lula da Silva during a rally in São Paulo last month in support of Flávio Bolsonaro, the right-wing opposition candidate.
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Adjusting the price of gasoline in Pôrto Alegre, Brazil, this year.
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The U.S. Consulate in Rio de Janeiro.
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A storefront offering personal loans in Niteroi, Brazil. Brazil is grappling with widespread household indebtedness, fueled by a combination of easy credit, the rapid expansion of legal and illegal online betting, and instant digital payments that have made borrowing, gambling and spending faster and easier.
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Supporters of the right-wing presidential candidate Flávio Bolsonaro waved American flags and brandished a blowup doll of President Trump clutching an imprisoned President Luiz Inácio Lula da Silva at a rally this month in São Paulo, Brazil.
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The Brazilian Supreme Court Justice Alexandre de Moraes has become a polarizing figure in the debate over policing online speech.
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Federal Revenue Service officers in Brazil setting up a drone for a flight in an area controlled by the agency in the Port of Santos this year.
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President Javier Milei of Argentina, left, with Flávio Bolsonaro, who hopes to be Brazil’s next president, last month. Mr. Milei’s strident support of Mr. Bolsonaro’s candidacy led to a rift with the current Brazilian president.
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Police officers in the Brazilian capital, Brasília, last year. Ahead of presidential elections this year, Brazilian officials are concerned about possible attempts by U.S. officials to undermine confidence in the voting system.
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Flávio Bolsonaro in São Paulo in June.
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Flávio Bolsonaro in Brasília following his meeting with President Trump at the White House.
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Members of the Red Command being arrested last year in Rio de Janeiro. The U.S. designated the gang a terrorist group on Thursday.
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President Trump with President Luiz Inácio Lula da Silva of Brazil at an economic forum last year in Kuala Lumpur, Malaysia.
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An illegal mine on protected land of the Yanomami people in the Brazilian Amazon.