Every State in the world has its own aeronautical authority; however, the regulations are not extremely different, first of all because they must still comply with international standards (ICAO) to enjoy the “freedom of the air of the Chicago Convention” and then because not everyone has the know-how to draft a very technical and complex regulation from scratch. Each therefore tries to standardize with others (usually with the American FAA, with the European EASA or with the other Eastern States that have different regulations from the first two groups).
Note: FAA = Federal Aviation Administration, which is the American equivalent of EASA.