Finland became an independent kingdom in 1918 and i believe there was discussion of Poland becoming a separate kingdom as well.
The Kingdom of Yugoslavia was introduced after WWI and during WWII the kingdom of Croatia was created for an Italian prince. 
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Norway did not establish a monarchy of their own until 1905. The United Kingdoms of Sweden and Norway was a union of the separate kingdoms of Sweden and Norway under a common monarch and common foreign policy that lasted from 1814 until its peaceful dissolution in 1905. The Monarch was the Swedish Monarch.
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