The answer is the sinking of the united states battleship Maine in Havana Harbor
To obey the Pope's call to free the Holy city from the infidels and ensure access for pilgrims. To be forgiven for past sins. The Pope offered forgiveness for anyone who took part. This was important for knights who had killed many people in battle. To see the world, have an adventure and prove their bravery.
The massive turmoil that the Reformation caused had a lasting impact on European politics. Soon after the Catholic Church deemed Martin Luther a “protestant,” Europe became divided along confessional, as well as territorial, lines. The religious turmoil of the period led to warfare within most states and between many.