How did Argentina join United nations in World War 2 if the Axis helped Argentina?

Answer 1

From http://www.state.gov/r/pa/ho/pubs/fs/55407.htm

The San Francisco Conference, formally known as the United Nations Conference on International Organization, opened on April 25, 1945, with delegations from fifty countries present. The U.S. delegation to San Francisco included Secretary of State Edward R. Stettinius, Jr., former Secretary of State Cordell Hull, and Senators Tom Connally (D-Texas) and Arthur Vandenberg (R-Michigan), as well as other Congressional and public representatives. Among the most controversial issues at the San Francisco Conference was the seating of certain countries, in particular, Argentina, the Ukrainian and Byelorussian Soviet Socialist Republics, and Poland. The vote to seat Argentina was particularly contentious because the Soviet Union strongly opposed Argentine membership arguing that Argentina had supported the Axis during the war. However, the other Latin American states refused to support the Ukrainian and Byelorussian candidacies if Argentina were blocked. The United States supported Argentina's membership, but also defended the Ukrainian and Byelorussian seats in order to maintain the Soviet Union's participation in the United Nations. The makeup of the Polish government was a continuing source of tension between the wartime allies, and thus a Polish delegation was not seated until after the conference.

Answer 2

The history of Argentina during World War II is a complex period of time beginning in 1939, following the outbreak of war in Europe, and ending in 1945 with the surrender of Japan. German influence in Argentina was strong, mainly due to the presence of a large number of German immigrants, and Argentina's traditional rivalry with Great Britain furthered the belief that the Argentine government was sympathetic to the German cause.[1] Because of the close ties between Germany and Argentina, the latter stayed neutralfor most of World War II, despite internal disputes and pressure from the United States to join the Allies.[2] However, Argentina eventually gave in to the Allies' pressure, broke relations with the Axis powers on January 26, 1944,[3] and declared war on March 27, 1945.[4]