The Icelandic is pretty homogeneous.And not only geographically but also historically. The present Icelandic is almost the same as the Old Norse of the first immigrants in Iceland in the eighth and ninth centuries. Current icelers can without much difficulty read the old Nordic sagas in their original language.
Yes sure, I know one country in each case: Israel.Israel has two official languages: Hebrew[1 and Arabic.Modern Hebrew or also called the Ivrite has no dialects.
Perhaps it is because of the young age of Hebrew, this language was revived in the 19th and only in 1948 became the official language of the country Israel.
I hope to have answered this question.
Also in countries where the population used to be fairly homogeneous, where until the beginning of the twentieth century the ordinary people often did not go beyond the boundaries of their village, people often had problems with the dialect that the people who Dozens of kilometers further on.I do not think so. In the archipelago which is now Indonesia (when deVOC came there in the seventeenth century Besrond it still from several King realms, large and small), where people from various regions (even on one island) spoke different languages-for example Sundanees in W. Java and Javanese in M. and O. Java-became a widespread language to a kind of lingua franca “exalted” to be able to speak with each other, and with the Dutch, the Malay/Bahasa Melayu, which is very similar to the current official national languages Bahasa Indonesia and Bahasa Malaysia, Which it appears to be geographically sourced.
In Europe, Denmark and Poland have almost no dialects.
In Poland the reason is that there has been a great deal of borders and many Polish citizens have lived in several regions.After the war, a new poles arose in which regional languages were much less relevant than before.
Denmark is a country where modernisation and standardisation have continued so far that traditions including dialects have been calved even harder than with us.At the houses you can no longer see in which Danish region you are, nor on clothing or other local items because they are no longer there. Only monuments and landscape sometimes give a brief indication.
Surprisingly, Russia has little deviation within its boundaries.When you look at old Soviet countries you can find dialects.
If there are, then it will be ultra-small countries like Luxembourg.Dialects are a natural phenomenon of language development that can differ between regions, ‘ generally civilized ‘ is an appointment imposed from above and not natural, and often still reasonably arbitrary and culturally determined also (ABN is closest to Dialects in the west of the Netherlands, because most people live there and decisions about the country are made.
However, the reverse does exist, a country without real agreements for a standard language, or at least no standard language that people want to speak.For example, in Norway they have attempted to introduce something like that, but no one is happy with it because each village talks differently, so no one is practicing standard Norwegian because it feels too forced.