The first (original) Nazi Party was in Germany, but the ideology, of imperialistic racist fascism (the lower-case "nazism" ideology, instead of just the original, upper-case "N" Nazi Party that was an example of it) can be in any country.
German racist-fascism or Nazism was organized by Hitler as anti-Jewish, anti-communist, and for a Thousand-Year Reich in which "Aryans" or purebred descendants of Adam and Eve in Genesis 3, would have control over the entire world, and there would be no descendants from the snake (Satan) in Genesis 3, which Hitler believed Jews to be.
The Slavic peoples in the Soviet Union would become enslaved to Aryans, and that land would be the main breeding ground or "Lebensraum" to expand the numbers of Aryans so that they could achieve further conquests, and he thought that the most difficult country for Germany to defeat would be America — but, that he and his fascist allies would first need to defeat all of Eurasia. Then, he would take on America. That was his plan, ever since 1919, and as of 1928, his
Second Book, and it never changed.
Conquest of all lands, and extermination of all Jews, was to produce his Thousand-Year Reich, which he thought would be "Paradise." Nazism wasn't only about exterminating Jews. It was also, very importantly, about conquering the Soviet Union.
Comment: See also: