establishment of khilafah is an obligation on muslim ummah

The Khilafah is a common leadership for all the Muslims in the world. Its role is to establish the laws of the Islamic Shari‘ah and to carry the da‘wah of Islam to the world. The establishment of a Khaleefah is an obligation upon all Muslims in the world. Performing this duty, like any of the duties prescribed by Allah (swt) upon the Muslims, is an urgent obligation in which there can be no choice or complacency. Negligence in performing this duty is one of the greatest sins, for which Allah (swt) punishes severely.
As for the Sunnah, Nafi‘a reported saying: “ ‘Umar said to me that he heard the Prophet (saw) saying: Whoso takes off his hand from allegiance to Allah (swt) will meet Him (swt) on the Day of Resurrection without having any proof for him, and whoso dies whilst there was no bay‘ah (allegiance or a pledge) on his neck (to a Khaleefah), he dies a death of jahilliyah.” So the Prophet (saw) made it compulsory upon every Muslim to have a bay‘ah on his neck, and described whoever dies without a bay‘ah on his neck that he dies a death of jahilliyah.

.. first try to post in a relevant section then introsduce khalifah..
.. wese khaifa is just a leader and u want aleader of all Islamic states? U think all the muslims would follow him ? and who will chose him? ost in Religious section..though it has been discussed at least 20 times in gupshup..

for ur kind information Degas its an obligation upon all the muslim Ummah to have only one Islamic state. And who will chose him? Muslim ummah will chose him. Its an obligation upon all the muslim like Sallat, Roza.
There should be a state like the Prophet Mohammad (Swt) built a first state in Madina, like Khulfa-e-rashida built a state including all the Muslim countries