aus der neuen welt?
Dvorak's 9th simphony is called "aus der neuen welt", however Welt is a feminine noun (die Welt). Is it because "aus" is a gentive preposition or am I missing something here?
As you suspected and as wataya confirmed/corrected, the preposition aus is always followed by the dative case. Here's a little table listing these prepositions, for a quick check when you have that sort of trouble: http://en.wikipedia.org/wiki/German_grammar#Prepositions_and_cases