Answer:
Independent State of Croatia, Hungary
Explanation:
After the subsequent invasion and dismemberment of Yugoslavia by Germany, Italy, Hungary, and Bulgaria in April, the newly established and so-called Independent State of Croatia joined the Axis on June 15, 1941.
After the Italo-Greek front opened on October 28, 1940, German pressure on Hungary and the Balkan States intensified. Hoping for preferential economic treatment, mindful of recent German support for annexation of northern Transylvania, and eager for future Axis support for acquiring the remainder of Transylvania, Hungary joined the Axis on November 20, 1940.
