Hi,
Some listers have posed the question of why their ancestors have migrated in any given decade (e.g. 1850's). You may like to refer to the British archives - the whole documents are not online but the precis of the contents are sufficient to give more than an inkling (idea) of unrest in Prussia/Austria. From 1860-1899 the reports (dispatches) from Europe to the UK government suggest Bismarck seemed to terrify all around him. I entered 'Bismar*' year ending 1902 and got words of "fear", "Intrigue" and "Warlike", and of course France popped up 
http://www.nationalarchives.gov.uk/catalogue/default.asp
1860 Berlin full of intrigues; efforts to turn out Schleinitz and replace him with Bismarck or Pourtal�s. The East: as to Italy taking part with Great Powers in discussions under 1856 treaty of Paris
1862:
Fears of Bismarck entering Prussian cabinet. The Hessian question.
Venetia. Recruits for the Italian cause in Montenegro. Health of the empress. Rechberg's objections to a British consul at Ragusa. Hercegovina. Austrian finances and commercial policy. Montenegrin uprising. Hesse. Austrian fears of Bismarck. French policy.
Schleswig Holstein question. Austro-Prussian relations: Rechberg's "terror" of Bismarck's foreign policy. Railway negotiations of MPs Roebuck and Lever "our English capitalists": their claim to have initiated discussion on a commercial treaty.
Schleswig Holstein. Bismarck's fears of alliance between Austria and France. Greek throne:
Greek throne. Arms at Bucharest. Austro-Prussian relations: Bismarck is Rechberg's b�te noire.
1863:
Austro-Prussian relations: Rechberg and Bismarck. R. Morier's report.
Russian warlike moves. seek audience with king William who has "surrendered himself entirely" to guidance of Bismarck.
Poland: probable Prussian intervention. enquiry about hereditary prince Leopold of Hohenzollern-Sigmaringen. Speculation on Bismarck's political future
The king's feelings about Austria; his bitterness against France. Bismarck's hopes of getting Poland for Prussia
Polish insurrection: inadequacy of Russian force. Bismarck's anger at publication of dispatches in Blue Book and at Morier's report of debates in the Chamber.
Lord Howard de Walden: King Leopold's anxiety about Prussia; "... the almost insane obstinacy of the King [of Prussia]" and "the blind folly" of Bismarck
Berlin: Schleswig Holstein: Bismark's views. Interview with the king of Prussia who, he fears "will be drawn helplessly down the current of events"
Frankfurt: Bismarck protests to Austria against proposed conference of princes
1864: Bismarck's harshness towards Denmark. Italy: as to financial provisions of the Zurich treaty.
Schleswig Holstein: as to British note on integrity of Denmark; while Bismarck retains power, Austria will follow. Difference of feeling in Vienna and Berlin about the war. Hungary: possible insurrection "... they [Austria] are always in hot water in some part of the imperial domains"
Austria's political and financial difficulties, but she will not yield Venetia without a war. Rechberg feels entangled in Bismarck's net. Failure of an Austrian loan.
Schleswig Holstein: Denmark will negotiate for peace; question of terms. Rechberg alarmed at but infatuated by Bismarck; his distrust of French games in Schleswig.
Lord Bloomfield reports Emperor of Austria back from sovereign's meeting infatuated with Bismarck and king of Prussia. Rechberg's reports of French intrigues in all quarters.
Schleswig Holstein peace conference at Vienna - "the Danish negotiations": proceedings. Conversations with Bismarck.
1865 Jan. 2 The Grove
commercial relations with Austria: their fear of Bismarck - "..... (they) seem to have lost all sense of independence"
1870 September & October:
FRANCE: Report. Interview between M. Jules Favre and Count Bismarck. PEACE Negotiations.
FRANCE: Count Bismarck to Count Bernstorff. Answer to Lord Granville's proposed Negotiations of an Armistice.
1871:
GERMANY & FRANCE & NETHERLANDS: Neutrality of Luxemburg. Satisfaction at explanation of Count Bismarck. Maintenance of Treaty of 1867.
GERMANY: Message of Count Bismarck relative to the sinking of British vessels in the Seine by German military authorities 8 Jan 1871
1877:
Crisis of 16 May 1877- 1877 July Europe: Correspondence with Reich Chancellor Bismarck during his absence from Berlin;
1882
German Legation Stockholm: Bismarck's policy towards France.
1885:
Menacing communication from Bismark; Report of a truce proposal from the camp of the Mahdi; New Guinea; Afghan frontier - refer to Map of Africa, showing the Eastern boundary of the German Protectorate, as proposed by Prince Bismarck in regard to Zanzibar.
1890-1899: Telegrammes to and from von Holstein, Letters from Graf Philipp Eulenberg to Freiherr von Marschall, Bismark's withdrawal from Alsace-Lorraine.
1915: German food supplies: devastation of harvest, etc.
