Kaiser Wilhelm I died of natural causes in 1888 three weeks shy of his 91st birthday...and was succeeded by his son Frederick III who died of cancer 99 days after acceding to the throne...the German Empire continued until 1918 under Frederick's son Wilhelm II. None of this was predicted by Baha'u'llah.
To Kaiser William I, Emperor of Germany, Bahá'u'lláh addressed these words in the
Kitáb-i-Aqdas:
Say: O King of Berlin! Give ear unto the Voice calling from this manifest Temple: Verily, there is none other God but Me, the Everlasting, the Peerless, the Ancient of Days. Take heed lest pride debar thee from recognizing the Dayspring of Divine Revelation, lest earthly desires shut thee out, as by a veil, from the Lord of the Throne above and of the earth below. Thus counselleth thee the Pen of the Most High. He, verily, is the Most Gracious, the All-Bountiful. Do thou remember the one whose power transcended thy power, and whose station excelled thy station. Where is he? Whither are gone the things he possessed? Take warning, and be not of them that are fast asleep. He it was who cast the Tablet of God behind him, when We made known unto him what the hosts of tyranny had caused Us to suffer. Wherefore, disgrace assailed him from all sides, and he went down to dust in great loss. Think deeply, O King, concerning him, and concerning them who, like unto thee, have conquered cities and ruled over men. The All-Merciful brought them down from their palaces to their graves. Be warned, be of them who reflect.
We have asked nothing from you. For the sake of God We, verily, exhort you, and will be patient as We have been patient in that which hath befallen Us at your hands, O concourse of kings! 2
In the above passages, Bahá'u'lláh refers to Napoleon III as the 'one whose power transcended thy power', and summons the Emperor to heed His call. But it was a call which remained unheeded.
The decline in the fortunes of William I and of his grandson William II was then set in motion, culminating in the dissolution of his Empire and the establishment of the Republic. In another passage in the same Book, Bahá'u'lláh reveals this remarkable prophecy which now after two World Wars is clearly seen to be fulfilled:
O banks of the Rhine! We have seen you covered with gore, inasmuch as the swords of retribution were drawn against you; and you shall have another turn. And We hear the lamentations of Berlin, though she be today in conspicuous glory.3
On the other hand, in 1897, Otto von Bismarck had warned Wilhelm II about the potential for mutiny and accurately predicted: "Jena [a battle in which Napoleon I defeated Prussia] came twenty years after the death of Frederick the Great; the crash will come twenty years after my departure if things go on like this" - Wilhelm had forced Bismarck to resign in 1890 and Bismarck died in 1898 - the "crash" - the downfall of the German Empire came in November 1918 - twenty years after Bismarck's death just as he had predicted.
The Revelation of Bahá'u'lláh, Volume 3, Chapter 8
I don't think by 'Crash' he meant 'death'.
Similarly for Alexander II - although he himself was assassinated (not an entirely unprecedented outcome for a Russian Czar) in 1881, his dynasty continued in power until 1917 under his son, Alexander III and grandson, Nicholas II.
I think you can find the explanation for that prophecy in the link as well:
The Revelation of Bahá'u'lláh, Volume 3, Chapter 8
I don't know about the other two but since we have now strayed into the realms of dynastic succession, what about Abdu'l Baha's prediction that Shogi Effendi's heir would become the Guardian of the Baha'i faith? Shogi Effendi, of course died childless. Oops!
Abdulbaha did not predict such a thing. He did not say it shall come to pass. He formulate it by stating that Shoghi Effendi must choose the next Guardian after himself who must be his son. In another passage of His will Abdulbaha also wrote when something happens and you need farther guidance you must refer to the Book of Aqdas. What happened was that, Shoghi Effendi did not have a child, so once Shoghi Effendi passed away, Bahais realized that since he did not have a son to be the next guardian, then according to the statement of Abdulbaha Bahais must refer to the Book of Aqdas for additional guidance. There is a passage in the Book where it can be clearly seen that Bahaullah had already ordained that after Them, Universal House of Justice must be elected and take over the leadership of Baha'i community. Now as regards to the formulation of Abdulbaha, there was a Wisdom in it, which can be discussed. It is compatible with theology that Bahaullah taught before. Thus Bahais do not think that Abdulbaha did not know this will happen, but they understand there is a wisdom for it...
Once a Person comes to believe that signs of divinity was manifested from Bahaullah, then there is a trust in Him. So, when we know Bahaullah's ability to reveal Books was not through any training or practices, and we also see He fulfilled Prophecies of passed Religions, and we also see how upright He was, and How spiritually powerful and wise He was, and that He was willing to sacrifice all His life for guiding people to the right path, even though He could have a comfortable and noble life, yet He accepted to be imprisoned and exile for guidance of humanity, we than know He was who says He was, and in such cases that you are referring, the Bahais realize and can believe there was a wisdom.
