The Iconoclast controversy caused the banning of religious icons in Christianity and the killing of supporters of the veneration of icons. The iconoclast controversy happened twice during the Byzantine Empire. This impacted the growing divergence between Western and Eastern Christian traditions, but the Western Church stood firmly with the belief that icons could be used, but the Church was still unified at the time.
They both controlled all aspects of daily life
The "Potato Famine" forced many Irish citizens to immigrate to America.
Indulgences
Hus opposed the sale of indulgences. Indulgences were documents of personal
forgiveness from the Pope which were sold for sometimes exorbitant prices
to raise funds for Crusades. he also called for preaching of the bible in all languages and also the giving of full communion to church members. In addition, he also called for higher morality among priests.
1 is the spread of slavery, but I'm not sure about 2
