Nationalism led to major conflicts following world war i, especially when

The correct answer is: "Hitler's nazism succeded in Germany"

Germany had been considered guilty for all the losses beared during WWI and was oblied, through the Treaty of Versailles signed in 1919, to pay economic reparations to some of the victorious powers. It was also forced to delimitarize and to keep its armed forces and weapon production at a minimum.

These requirements severely damaged the German economy, causing a big recession and even an hyperinflation crisis. Germans felt humilliated and this is one of reasons why, when right-wing extremist and nationalist forces, leaded by Hitler, emerged promising to stop that situation and to restore German pride and to put Germany in the position it deserved among the strongest European powers, Germans supported Hitler.

one of these is the rhoticity common in most american accents, because in the 17th century, when english was brought to the americas, most english in england was also rhotic.