Immediate effect of Imam Husain’s sacrifice:
Muslims and non-Muslims both have admitted that Imam Husain (a.s) spared Islam from annihilation by sacrificing his life. The majority of Muslims gave their support to Yazid whilst the minority stood silent out of fear. The laws and principles of Islam were being disfigured, the prophetic traditions were being altered and fake customs were being introduced to legitimise the authority of Yazid. It was the sacrifice of Imam Husain and his dedicated supporters that shook the Muslims from their sleep. After witnessing the brutal murder of the Imam and his associates, the Muslims discovered how wicked their Ruler was as he didn't even spare the grandson of the Holy Prophet (pbuh&hf).
Long term effects of Imam Husain’s actions:
Imam Hussain (a.s), by refraining to pay Yazid the oath of allegiance and the method he chose to lay down his life, changed the course of history and re-shaped the fate of humans forever. Yazid and his likes were given the message that they will not be supported nor tolerated and justice would prevail regardless of the price. Many revolutions that that have taken place against the wicked are some of the outcomes of the lessons taught by the Imam.
Imam Husain's preparation for his sacrifice at Karbala:
Imam Husain refrained from escaping or avoiding Yazid, in light of the fact that such an act would not have uncovered Yazid's debasement of Islam and would have served to legitimise his vile Leadership.. He realised that by dismissing Yazid's orders, he would doubtlessly be murdered. In any case, he chose not to pass away like any other ordinary martyr. He needed his demise to fill in as a beginning stage for a transformation that would fortify equity and restrict oppression for all times to come. This sort of stand required foresight and pre-planning. As hinted by the history, Imam Hussain's pre-planning included the following elements:
1. The selection of an area where he would be killed.
2. The selection of companions of various ages and genders.
3. A perfect preparation to have his sacrifice captured by the historical records.
The selection of an area where he would be killed:
Imam Hussain, abandoned the idea of completing his Hajj rituals, as he He did not want any bloodshed in the precincts of Makkah. Moreover, if he was killed during his performance of the Hajj, the murderers and their motives may have remained a mystery and therefore his sacrifice could have remained ineffective. So he chose to travel to Iraq to answer the call of the Kufians, knowing that his journey could be intercepted by the forces of Yazid who would eventually kill him and thus, their Leader Yazid, will be exposed of his wickedness. The history has demonstrated that Imam Hussain was correct.
The selection of his companions:
Imam Husain did not search for the best warriors, since his objective was not to battle or win a physical war. He selected men who were firm, pious and patient. Such who were ready to experience extreme hardships without any complaints.
His associates included men of various tribes, females and children. The reason behind such a choice was to prevent people from thinking that Hussain (a.s) initiated a war or that his sacrifice is distorted as a battle of power between two tribes.
A perfect preparation to have his sacrifice captured by the historical records.
A good number of Imam Hussain's family members (consisting of females and children) travelled with him. Such an approach guaranteed that after his demise, his message would be spread through his surviving relatives, and that Yazid would not have the capacity to obscure the reality or misrepresent Imam Husain's thought processes. History demonstrates that it was a splendid move. His son Ali bin Hussain (a.s) and his sister Zainab (s.a) through their penetrating speeches, brought to light some hidden facts and uncovered the deception of Yazid in his own court. He was stunned and mortified before them. His court was loaded with dignitaries, both neighborhood and from other country states, and his own supporters. They were surprised to discover the reality unfold itself and many were conveyed to tears. Eventually similar scenes were rehashed in the bazaars and commercial centres of the nation, up and down the travel course of the surviving captives. Imam Hussain had established the framework of the revolution with his blood, whereas his sister Zainab and his son Ali ibn Hussain propelled it with their talks. That revolution gave many communities hope, courage, determination and success and will continues to do so until the end of time.
The events relating to Imam Hussain's sacrifice, before and after, have been well preserved in the books of history. As the Imam desired, his sacrifice was captured like no other. It was promoted like no other. Hence today, we have the largest gathering on the face of the earth. Karbala receives between 20-25 million people every year, in a single gathering, during the days of Muharram.