The history of Muslim persecution is long and varied, and it started when the religion was still young. The First Crusade began in 1095 in order to recapture Jerusalem, which was held by those of Islamic faith. Christians and Muslims were essentially at war with one another already, especially since the Fatimid Caliph turned the Constantine Church of the Holy Sepulcher into rubble decades earlier, along with hundreds of other sites sacred to those of Christian faith.
When the Crusaders took Jerusalem by storm, they butchered everyone. They almost completely cleared the city of human life, slaughtering Jews and Muslims without hesitation. They burned down synagogues and mosques with worshippers still inside. It never really got better.
The Japanese enacted a killing policy during the Second Sino-Japanese war. They destroyed hundreds of mosques. During the Nanking Massacre (or the Rape of Nanking), Japanese troops indiscriminately murdered and raped residents of Nanking, which was the capital of the Republic of China. It began on December 13, 1937, and lasted for six weeks. There may have been hundreds of thousands of citizens who were affected by this atrocity.
A mosque in Nanking was discovered filled with the dead. After the massacre had ended, the survivors buried the bodies in proper Islamic fashion.
After 9/11, hate crimes perpetrated in the United States took a turn for the worst. There were 354 hate crimes recorded in the year 2000. Even though 9/11 occurred late in the year, it still left time for the number of crimes to skyrocket to 1,501. There have been a number of violent attacks and murders ever since.
There is an increasing number of tensions in mainland China. Islamic-style beards, clothing, and headwear have been banned on public transportation in Karamay. Some styles of dress have been banned in Xinjiang province. Members of the Communist party are banned from partaking in sacred Ramadan fasting. Around 120,000 Muslims were taken to “re-education camps” (detention camps) in order to force these individuals to adjust their thinking. Other media reports have estimated the number stands at around a million people taken so far.