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.
Marriage in the United States with the exception of Nebraska (19) and Mississippi (21). In addition, all states, except Delaware, allow minors to marry in certain circumstances, such as parental consent, judicial consent, pregnancy, or a combination of these situations. Most states allow minors aged 16 and 17 to marry with parental consent alone. 30 states have set an absolute minimum age by statute, which varies between 13 and 18, while in 20 states there is no statutory minimum age if other legal conditions are met. In states with no set minimum age, the traditional common law minimum age is 14 for boys and 12