Historically there was a long-standing competition to control Estonian territory, primarily between Russia, Germany, Poland, Sweden, and Denmark, until 1710 when this area was conquered and ruled for two centuries by Imperial Russia. In the twentieth century, the only rival to Russia's (USSR's) domination over Estonia has been Germany. A Norwegian security analyst, Olav Knudsen, says correctly that the Baltic states “fall outside all other geographical and political contexts than the Russian and to some extent the German one.” As is known, Estonia was occupied by Germany in the course of the World Wars in 1918 and 1941–44. Generally speaking, the pre-1991 history of Estonia is a good case to prove that the survival of small states as independent powers is precarious, “depending on a multitude of factors over which they have little influence.”