Ostravaball is a cityball of 
Czechball.
History
Ostravaball was born as a 2ball, adopted by Germaniaball, HREball, Habsburgball, Austria-Hungaryball, Nazi Germanyball, Czechoslovakiaball and Czechball.
 The Czech Republic: Truth prevails
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| Regions |  Central Bohemiaball •  Hradec Královéball •  Karlovy Varyball •  Královecball Liberecball •  Moravia-Silesiaball •  Olomoucball •  Pardubiceball •  Plzeňball •  South Bohemiaball •  South Moraviaball •  Vysočinaball •  Ústí nad Labemball •  Zlínball
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| Region Capitals |  Brnoball •  Ostravaball •  Plzeň Cityball •  Pragueball
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| Geographical regions |  Bohemiaball •  Moraviaball •  Silesiaball
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| Former entities |  Migrants from the East (Prehistoric Europeans) •  Celtsball •  Germaniaball •  Slavsball •  Avarball •  Samo's Empireball •  Great Moraviaball •  Duchy of Bohemiaball •  Kingdom of Bohemiaball •  Austria-Hungaryball • Czechoslovakiaball •  Nazi Germanyball ( Protectorate of Bohemia and Moraviaball) •  Czechoslovak Socialist Republicball ( Czech SRball) • Czech and Slovak Federal Republicball
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