States of Austria arable terrain. The other five states, in contrast, are located in the Alps and thus are comparatively unsuitable for agriculture. Their terrain is also relatively unfavourable to heavy industry and long-distance trade. Accordingly, the population of what now is the Republic of Austria has been concentrated in the former four states since prehistoric times. Austria's most densely populated state is the city-state of Vienna, the heart of what is Austria's only metropolitan area. Lower Austria ranks only fourth with regard to population density even though it contains Vienna's suburbs; this is due to large areas of land being predominantly agricultural.
Languages of the United States Languages of the United States The most commonly used language in the United States is English (specifically, American English), which is the de facto national language. Nonetheless, many other languages are also spoken, or historically have been spoken, in the United States. These include indigenous languages, languages brought to the country by colonists, enslaved people and immigrants from Europe, Africa and Asia. There are also several languages, including creoles and sign languages, that developed in the United States. Approximately 430 languages are spoken or signed by the population, of which 176 are indigenous to the area. Fifty-two languages formerly spoken