typically its is a language used in citizen interactions with goverment offcials and it does not refer to the language used by a people or country but by its government
is one of the official languages of the United Nations, the Europinian Union, the African Union, Organisation of Islamic Cooperation, Caribbean Community, Union of South American Nations and other international organizations.
English is by right not an offficial language at national level, but most states and territories within the united states have English as an official language (only Puerto Rico uses a language other than english(spanish))
do not have english as an offical language claimed by law but its condisdered to be their de facto offical language due to its dominant position in these countries