The swastika symbol has been around for thousands of years. early meaning from the word is translated as 'good to be' or 'well being'. It has long been popular in Eastern cultures and was a common decoration that often adorned postcards, coins, and buildings. During World War I, the swastika was found on the shoulder patches of the American 45th Division. American and Canadian Indians also used the symbol with various positive meanings.
Germany began using it during the 1800s because it had ancient Aryan/Indian origins, to represent a long Germanic/Aryan history (before Hitler). It is now outlawed in Germany.
In 1920, Hitler decided that the Nazi Party needed its own insignia and flag. The new flag had to be "a symbol of our own struggle" as well as "highly effective as a poster," from Mein Kampf. The symbol was turned on a 45 degree angle and took on a new meaning equated with hate, death, and murder. It became popularly used in his 1935 flag.
Budhists and Hindus continue to use it as a religious symbol. Since the Nazi use of the swastika, many are trying to differentiate the two meanings of the swastika by varying its direction, with the clockwise Nazi version to mean hate and death, and the counter-clockwise version to keep the ancient meaning of life and good-luck. Either way it will continue to evoke strong emotions.