That is not correct.

It is perfectly normal in German to say 'in Amerika' or in French 'en Amerique'. That usually means the complete continent, unless there is already a context which, for example, narrows it to a specific part, like the US.

If one wants to know more, one has to ask back 'in north, south or middle America?' or 'Where in America'.

Virtual no one in the world thinks of "America" as referring to all of "North America" and "South America".