Could Nazism/Hitler have just as easily happened to?

Of course it could have. The circumstances were just right in Germany, but whose to say that the circumstances would not have been perfect in America during the depression, given the right (wrong?) person to find a scapegoat and get elected into office? Or in England after WW1 during the recession?

It's possible someone could easily try to do it again today, but with mass media and things like the UN and European Union, international treaties, etc, it's less likely they would be able to go so far.

Could someone do it again? Sure, if the conditions are right.

Were all of those countries equally likely to have it happen at the time? No. For example, America wasn't humiliated in a war, its economy wasn't shattered, it didn't lose territory, isn't as densely populated, didn't suffer from the fact that "americans" are scattered among different countries (unlike ethnic germans), and it doesn't have the history of extreme Jewish persecution that Europe (not just Germany) has. Germany also had a much shorter experience with democracy than America or Britain.

Britain developed somewhat separated from the culture of continental Europe.

Other countries might be more likely. Many eastern Europe countries which had just become democratic (and eventually turned powr over to dictators).

France was pretty messed up, but it has a long tradition of at least wanting to support democracy (although their success at it is complicated, to put it nicely.)

Yes. Socialism™ took over in Germany but in other countries as well. Remember that Hungary and Italy (and to some degree Spain) sided with the Socialists™ in Germany at that time. As did Russia for a while. And of course the allies in the Middle East's Islamic countries also sided with Hitler's goals.

In times of desperation and economic collapse, even Socialism™ can start to look good. And it is important to remember it could have anywhere AGAIN.

Any dictator gaining total absolute loyalty, a heirarchy of control by building an excellent totalitarian economy

could have led that nation to war against other capitalistic nations.

The Nazi regime enabling ghastly genocidal, armed forces destroying millions of fighters, loyalties,

treaties,

civilians, and families and economies and razing cities,

has furnished a horrendous example to be avoided.

If you're talking about jew-killing antisemitism then it wouldn't have happened in the U.S. nor England, though perhaps in other places that have tainted perspectives of our favorite Yahweh worshiping desert tribesmen. If you're talking genocide in general, then it is possible anywhere given favorable circumstances.