in the same way that the revival of islam had swept across a war torn somalia in the 1990s , and branches of macdonalds through an economically isolated and burger-bereft eastern europe during the same decade - in each case the new influence which had prevailed was largely the first to have arrived , but islam in eastern europe and macdonalds in somalia could have proved equally successful if only their chronological arrival had been different - so the vacuum would inevitably be filled : it is true what they say , that nature abhors a vacuum , be it physical , spiritual or moral , it can not be allowed to exist in isolation for too long .