Budapest is the capital of Hungary, so the language spoke is Hungarian.
There is no 'Official Language' for the US. However English is the most common by far in day-to-day conversation and most business transactions.
Turul
There is not one official language spoken by the world.
The official language spoken in England is English.
The official language spoken in Panama is Spanish.
The official language spoken in the Netherlands is Dutch.
The official language spoken in Montserrat is English.
The official language spoken in Bratislava, Slovakia is Slovak.
The de facto official language spoken on Christmas Island is English.
The two official languages spoken in Barcelona are Catalan and Spanish. Catalan is the primary language spoken in Catalonia, including Barcelona, while Spanish is also widely spoken and understood in the region.
The official language spoken in Romania is Romanian.