In 2021，a number of Latin American countries held elections. The elections in some countries only have the nature of ruling in turn. However，the elections in some countries are brewing a change in their own development model. They advocate the emergence of the extreme left wing that restricts mining industry and green economy and the extreme right wing that advocates liberal economy. The left wing in Latin America is divided domestically and United internationally to continue to expand development space，However，the phenomenon of ideological polarization and political fragmentation in Latin American countries has intensified. It is worth noting that the “Left” and “Right” in Latin American countries’ politics pursue different development models to a certain extent. In 2022，the left wing has made history in Colombia’s general election，breaking the situation that the right wing has been in power for a long time. In Brazil，the largest country in Latin America，the left wing returned and Lula was elected president，which may have a far-reaching impact on the U.S-Latin American relations and Sino-Latin American relations.