Yes, Mackenzie King visited Hitler in 1937
There no evidence for it. It can safely be assumed that it is an urban legend.
No, but he did visit Graz when he annexed Austria in 1938.
Yes, Adolf Hitler did visit Poland. In 1939, Adolf Hitler invaded Poland and forced the leaders of the country to sign an agreement that stated that Poland's Army would not resist the takeover.
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Heil is a form of greeting. So it was natural to use this term to greet Adolf Hitler. The Nazi stiff-arm salute that was used when saying this originated from the ole Roman salute. Hitler may have adopted this from his first visit with Mussolini in Italy.
in 1937
At first he just went to visit the United States, but Adolf Hitler rose to power in Germany, and he decided to stay and become a United States citizen.Einstein only planned to visit America, but became a citizen during the rise of Nazi Germany, repulsed by their new leader, Adolf Hitler, and his stance against Jews. He probably did not expect them to place a bounty on his head and burn some records of his work.
No he did not. A couple British authors claim that Hitler crashed at his half-brother's apartment in Liverpool, UK for a few months around 1912, but this is difficult to prove/disprove. Hitler was dirt poor and living in Vienna, Austria at the time, so it seems unlikely he could have afforded such a trip.
No.
No, for obvious security reasons. In those days, Dictators and world leaders seldom went about voyaging, You had diplomatic envoys for such stuff.
Nazi Germany conquered France along with Belgium and the Netherlands after the Battle of france in May 1940.
No, he never did.