Hungary–Romania relations
During World War II, Hungary and Romania became allies and participated in the war against the Soviet Union. But after the coup on 23 August 1944 Romania switched sides and fought against Hungary. Consequently, Soviet and Romanian troops invaded Hungary, occupied Northern Transylvania by October 1944 and re-established the Romanian administration in the region in March 1945. The 1947 Treaty of Paris reaffirmed the borders between Romania and Hungary as originally defined in Treaty of Trianon 27 years earlier, thus confirming the return of Northern Transylvania to Romania.
Carol II of Romania
Forced under Soviet and subsequently Hungarian, Bulgarian, and German pressure to surrender parts of his kingdom to foreign rule, Carol was finally outmaneuvered by the pro-German administration of Ion Antonescu and abdicated in favour of his son Michael in September 1940. He went into exile with Lupescu, initially in Mexico, but ultimately settled in Portugal. In Mexico City, he purchased a house in one of the city's more expensive districts. During World War II, Carol tried to set up a Free Romania movement based in Mexico to overthrow General Antonescu. Carol had hopes that his Free Romania movement would be recognized as a government-in-exile, and would ultimately lead to his restoration as king. But the closest Carol ever came to having his Free Romania movement recognized came in 1942, when President Manuel Ávila Camacho allowed Carol to stand besides him while reviewing his troops. Carol would have liked to operate out of the United States, but the American government refused him permission to enter. Carol was in contact nonetheless with two Eastern Orthodox priests living in Chicago who organized an unsuccessful campaign in the Romanian-American community to pressure the American government to recognize the "Free Romania" committee as the legitimate government of Romania. To advance his cause, Carol published a magazine in America called "The Free Romanian" and published several books in both Romanian and English.