What is of greater significance for us in today's time is a political lesson in the martyrdom of Hussain (RA).
Historically,  the 10th of Muharram is a special and a unique date like no other that  connects many of Allah's (SWT) Prophets (AS).
On this day...
1. Allah (SWT) saved Sayyidina Nuh (AS) and his companions in the ark. 
2. Allah (SWT) spoke directly to Sayyidina Musa (AS) and gave him the Commandments. Also on this day,
3. Sayyidina Imam Hussain (RA) achieved the honor of Martyrdom.
2. Allah (SWT) spoke directly to Sayyidina Musa (AS) and gave him the Commandments. Also on this day,
3. Sayyidina Imam Hussain (RA) achieved the honor of Martyrdom.
No  doubt the 10th is a unique and momentous day which should be  remembered. A day which links many of the Prophets together in struggle  against tyranny and forgiveness.
However  the last event listed carries a special significance for us because  Imam Hussain (RA) struggled against Yazid who had usurped the right to  become the Khaleefah and attempted to force himself on the ummah. A man  can only become the rightful Khaleefah with the pledge of allegiance. No  man can be a ruler without the consent of the ummah. Yet, Yazid  attempted to circumvent this sunnah of the Prophet Muhammad (Peace be  upon Him). Imam Hussain (RA) stood up to this political tyranny and paid  with his life.
No  man can be a ruler by force nor can a man be a ruler by birthright. It  is only the pledge of the ummah that crowns a man a ruler. This a a  fundamental principle in Islamic ruling which today has been  disregarded.
In  short, the ruler is appointed by the people on condition he rules by  Islam. The ummah today is plagued by dictators and agents who rule over  her. It is high time the ummah took back her right and appoints the  rightful Khaleefah. The sacrifice of Hussain (RA) is once again being  called for.
Source: wateen.net
 
