“It is not permissible for Muslims to abandon working for Islam and the establishment of its state on the face of the earth, waiting for the appearance of the Mahdi and the descent of ‘Isa, peace be upon them both, feeling despair and imagining that is not possible before (they appear). This notion is false.” [Shaykh al-Albani]
"The scholars have agreed that it is not permissible for two caliphs to be appointed in the same time, irrespective of whether Dar al-Islam [the Abode of Islam] was widely spread or not."
Our disunity as a Muslim Ummah is painfully apparent every Ramadan. We cannot agree on when to begin fasting and when to celebrate Eid. This reality is pointed out with glee by the enemies of Islam. Even countries which are neighbours announce the beginning and end of Ramadan on different days. It seems that when it comes to this issue (among a vast array of others), we are still suffering from the historical decisions of the colonial powers which divided our lands (as was the case with the secret Sykes-Picot agreement of 1916, which partitioned the Ottoman Caliphate).
It must be known that this aspect of Islam, i.e. the enjoining of what is right and forbidding of what is wrong, has largely been neglected for a very long time and very few aspects of it remain. Yet it is very important, indeed it is the principle that ensures society remains on the right course. When evil spreads, punishment is inflicted on the good and the bad alike. Unless people stop injustice, Allah may well extend his punishment to all of them. He says: ‘Let those who would go against His bidding beware, lest some affliction or painful suffering befall them’ (24:63). Its benefit is great indeed, particularly because it has been largely neglected, and a person who seeks success in the life to come and hopes to earn Allah’s pleasure should be keen to undertake this duty.
The Caliphate 