As the U.S. looks towards next year’s presidential election, Latin America countries are experiencing big changes in leadership as well as challenges to old regimes. Here are the leaders to look out for in 2016.

Argentina

When the newly elected right-leaning leader Mauricio Macri took office on Dec. 10, he immediately made good on his promise to move his country away from “Kirchnerism” by lifting the currency controls on the Argentine peso. He also lifted taxes on exports in order to stimulate trade and spending.

As previously reported, Macri has gotten involved in issues outside of Argentina’s borders by requesting that the Venezuelan government release their political prisoners.

Venezuela

Venezuelan President Nicolás Maduro’s party, the United Socialist Party of Venezuela (PSUV) was seriously weakened by the recent national assembly elections that saw the conservative Democratic Unity coalition secure two-thirds of the house seats.

Maduro sees the surge in right-wing popularity as a genuine threat to his administration and has gone so far as on to warn his military about the possible dangers to come. As previously reported, Maduro spoke to his soldiers about an impending showdown between the right and the left. "We're facing a large-scale crisis that is going to generate a power struggle between two poles: the patriots and the anti-patriots," he said.

Brazil

2015 was a bad year for Brazil’s President Dilma Rousseff. Just months into her second term there were already calls for her resignation.

Rousseff's unpopularity stems from Brazil’s crumbling economy. Things are so tight right now that athletes participating in the upcoming summer Olympic games in Rio de Janeiro have been asked to pay for their own air-conditioning.

As previously reported, impeachment proceedings against Rousseff began in early December. Those who want Rousseff out of office claim she broke the law while managing last year's budget.

Rousseff expressed her anger and disbelief at the impeachment proceedings via a televised address to the nation. “There is no wrongful act committed by me, nor are there any suspicions that I have misused public money,” she said.

Mexico

Mexican President Enrique Peña Nieto is seen by many as a symbol of political corruption. Critics point to his $7 million mansion, which he claims belongs to his former actress wife, as proof of political payoffs. The fact that the title on the house is owned by a construction corporation that was awarded lucrative contracts from Peña Nieto’s administrations during both his governorship and his Presidency does not help with public opinion.

According to The New Yorker, Peña Nieto recently announced ten measures intended to help Mexico deal with corruption. Some of the President's suggestions -- which were derided by the public -- include uniting the country's municipal forces under the control of the state police and implementing a national emergency telephone number.

Bolivia

Bolivian President Evo Morales, who came to power in 2006, remains a popular leader is his country.

TeleSUR reports Morales currently maintains an approval rating of about 66 percent.

As previously reported, an amendment was recently passed by Bolivia's congress which might allow Morales to stay in office until 2025. The amendment is set to go to a national referendum in February.

Morales claims he does not plan on being President for life. "I'm not trying to stay in power forever," said the 56-year-old leader.