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it fell apart because the government changed.
Yugoslavia
Yugoslavia and the USSR (Soviet Union)
Yugoslavia
Croatia didn't fell apart. But Yugoslavia fell apart and one of the countries is Croatia.
Czechoslovakia, Yugoslavia, & USSR.
The USSR Yugoslavia
The correct spelling is collapse (to fall down or apart).
The Soviet Union and Yugoslavia are such countries.
Croatia didn't split
It is more accurate to say that it was a collapse from within rather than an overthrow from without the government. The riotous protest demonstrations that became known as the February Revolution were not actions designed to overthrow the government They were demonstrations and strikes that the Tsar could no longer control except by appeasing the demonstrators with his abdication. The Tsarist government simply fell apart in the face of this crisis when it could not deal with it.
All the treaties"fell apart" because the US government failed to honor them or to enforce them.