In his inaugural speech, multi-millionaire businessman Horacio Cartes, of the centre-right Colorado Party, promised to wage war on poverty.
Paraguay is one of the poorest countries in South America.
Horacio Cartes, a relative newcomer to politics who had not voted before 2008, was elected with 45.8% of the ballots in April.
He defeated his closest rival, the Liberal Efrain Alegre, by nine percentage points.
“I’m not in politics to make a career of it or become wealthier,” Horacio Cartes, who is one of Paraguay’s richest men, said.
“I’m in politics to serve my people, improve the future of new generations and treasure our identity as a free, independent and sovereign people,” he added.
He also promised to “put the fatherland first” and to “create opportunities for all” to combat Paraguay’s rampant inequality.
Horacio Cartes had campaigned on a platform of poverty reduction and job creation.
Choosing his cabinet, he broke with the established tradition of naming senior party members to key posts, instead choosing technocrats and business people.
His Colorado Party was in power for 60 years and played a key part in supporting the military rule of General Alfredo Stroessner from 1954 to 1989.
In 2008, it was beaten by a left-wing coalition headed by Fernando Lugo.
Fernando Lugo was controversially impeached by Congress over his handling of a land eviction in which 17 people died.
The impeachment process took less than 48 hours and was deemed unfair by many of Paraguay’s neighbors and led to the country’s exclusion from the Mercosur trading bloc.
The presidents of the Mercosur countries (Argentina, Brazil, Uruguay and Venezuela) said in July that they would lift the suspension after Horacio Cartes’ inauguration.
However, Paraguay said it would not return to the Mercosur fold as long as Venezuela held its rotating presidency.
Paraguay has objected to Venezuela’s inclusion in the trading bloc.
Asuncion says that a new member can only be included after a unanimous vote and argues that such a vote should not have been held while Paraguay was suspended.
Venezuelan President Nicolas Maduro was not invited to Horacio Cartes’ inauguration.
Foreign Minister Eladio Loizaga said he would rather deal with Paraguay’s neighbors individually at first.
“We have pending issues with Argentina, with Uruguay; we have to recompose all that,” he said.
“Mercosur will be later because our priority is the bilateral relations,” he added.
Venezuela holds Mercosur’s rotating presidency until July 2014.
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