How did marx and engels rate the chances of communism in germany, england, america and russia?

Marx & Engels put forth the theory of dialectical materialism, which states that history follows and inevitable pattern, and communism is the final stage of history, after the capitalist state falls victim to its own tensions and contradictions.  According to the original Marxist theory, a nation needed to go through the phase of industrialization and capitalist economy in order to become ready for the communist revolution to occur.  By that standard, Germany, England and America all would have represented better chances for communism to take over, because those nations were all progressing through the industrialization phase.  England had begun industrializing first, then Germany and America followed suit.  A Marxist interpretation of history would have expected dialectical (push and pull) tensions between capitalists and workers to happen in those countries before Russia, which was very slow to move toward industrialization.  However, that's not how history unfolded.  As you likely know, the first major communist revolution occurred in Russia (in 1917).

Both countries had to aprove annexation.