The correct answer to this question is no. Though Halloween is a popular holiday, it is not celebrated all over the world. The United States is where Halloween is celebrated the most. Many people decorate their homes, and during the month of October, there are a number of events that take place to celebrate the season.
Like the United States, countries like Austria and Czechoslovakia celebrate Halloween. Countries that don't include Germany, China, Europe, and Mexico. Even if a country celebrates it, all of its citizens may not celebrate it. For instance, Jehovah's Witnesses that reside in the United States do not celebrate any holiday, which includes Halloween.