The European country was Spain. Spanish conquistadors were the first to explore and map out Texas in 1519.
Many Chinese people supported the nationalists because they believed the Manchos Dynasty has lost the Mandate of Heaven
The Coptic religion, which was a branch of christianity, was declared, also giving birth to the legend of prester john, which I would look up.
The event that occurred in the 4th Crusade was the Crusaders attacked Constantinople. The sack of Constantinopea took place in April 1204, during the 4th Crusade. The Crusaders attacked, destroyed and robbed during the assault of Constantinople. (Hope this helps! :)