Do persistent economic uncertainties in many semi-socialist countries indicate that Marx was wrong about communism being the end of history?

Do persistent economic uncertainties in many semi-socialist countries indicate that Marx was wrong about communism being the end of history? Or do they support his assertion that communism is the ultimate result of the contradictions inherent in capitalistic and semi-socialistic countries? Could America be farther along the road to communism/socialism than communistic and semi-socialistic countries that have tried to "skip" the full development of capitalism? Cite specific examples and argue for your position.