!) Assuming you are committed to “wave of”, you need something suitable to follow: “a wave of enthusiasm/agitation/fervour…”

2) Greater German (adjective) nationalism is linguistically challenging for the reader as, at first glance, it suggests increased nationalism on the part of Germans. You therefore need a formulation that is built around Greater Germany (noun): "enthusiasm/agitation for", "belief in"; "dedication to"

"Heim ins Reich," which literally means "Home into the Empire," was a policy pursued by Hitler beginning with the Anschluss of Austria and the annexation of Czechoslovakia's Sudetenland in 1938. The ultimate aim was to convince ethnic Germans living outside the Third Reich to agitate to be included in a so-called "Greater Germany."
http://www.foxnews.com/politics/2014/03/05/hillary-clinton-c...

In view of all these considerations, the welcome accorded by the Swiss people and their representatives to their imperial host should not pass the point of simple dignity. It would be very regrettable if the Swiss people, by associating themselves too enthusiastically with the demonstrations of the 300,000 Germans who live in Switzerland, and the thousands who have flocked to Switzerland for the occasion, should give the impression that their enthusiasm for Greater Germany is more to them than their Republican traditions.
http://www.archive.org/stream/edinburghreviewo217londuoft/ed...

Even the young, for all their enthusiasm for a Greater Germany, were now anxious about the situation.
http://tinyurl.com/p9nmggd

In spite of their enthusiasm for a greater Germany, the various elements in liberalism have lacked the cementing force of some economic interest, and all of the brilliance of orators and statesmen like Bassermann and Paasche has not been able to replace this lack.
https://archive.org/stream/germanempirebetw027386mbp/germane...


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Note added at 9 hrs (2014-03-10 19:29:58 GMT)
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One of those factors was the compliance of conservative elites in the military, the civil administration and the world of business. They did not share Hitler's crude concept of racial superiority, and many of them feared a war with the Western powers. Nevertheless, they dreamed of acquiring global power and had aspirations to create a Greater Germany that would, at the very least, dominate Eastern Europe. They included men like Franz Halder, the commander-in-chief of the army, who announced in the spring of 1939 that his men had to overrun Poland and would then, "filled with the spirit of having emerged victorious from enormous battles, be prepared to either oppose Bolshevism or be thrown to the West."
http://www.spiegel.de/international/europe/the-road-to-world...


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Note added at 2 days15 hrs (2014-03-13 01:19:30 GMT)
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Pan-Germanism
I would associate this with the voluntary unification of states and peoples that had been artificially kept separate in the sole interest of their local rulers (Kleinstaaterei*). It is far too harmless a term/concept to apply to the annexation by force of a territory on the basis that a vocal minority 'invite' the protection of their kinsman over the border, as was the case in Bohemia/Sudetenland in 1938 (parallels with Crimea in 2014)

The song is also well known by the incipit and refrain of the first stanza, "Deutschland, Deutschland über alles" (literally, "Germany, Germany above all"), but this has never been its title. The line "Germany, Germany above all" meant that the most important goal of the Vormärz revolutionaries should be a unified Germany overcoming the perceived anti-liberal Kleinstaaterei. Along with the Flag of Germany, it was one of the symbols of the March Revolution of 1848.
http://en.wikipedia.org/wiki/Deutschlandlied

Kleinstaaterei is a German word, mainly used to denote the territorial fragmentation in Germany and neighbouring regions during the Holy Roman Empire (especially after the end of the Thirty Years' War) and during the German Confederation in the first half of the 19th century.[1] It refers to the large number of virtually sovereign medium and small secular and ecclesiastical principalities and Free Imperial cities, some of which were little larger than a single town or the grounds of the monastery of an Imperial abbey. Estimates of the total number of German states at any given time during the 18th century varies, ranging from 294 to 348,[2] to more.
http://en.wikipedia.org/wiki/Kleinstaaterei