Napoleon was never able to invade Britain because he needed to cross the English Channel. To do this he required a large number of warships to protect his troop transports in position at the right time. The Battle of Trafalgar prevented his warships from joining up with the transports.
Germany did not invade Britain in WW2. Britain has not been invaded for a thousand years.
The British regularly invade Florida!
The Normans in 1066
Poland.
becausew he could invade Great Britain
The Normans
Many of their enemy's navies did not stand a chance against Great Britain's navy making it almost impossible to invade.
Significant for Great Britain, the war was not global yet as the US was not in it; and Germany would not invade Britain since they did not control the air.
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Germany was unable to cross the English Channel (50 miles of water) to invade Britain.
Because Bennito Mussilini waS a dictator
During World War II, Germany gave up its plans to invade Great Britain because he could not defeat the British air force.