In what year was the first modern World Series played?

What is the name of the spring training league held in Florida? What is the name of the spring training league held in Arizona? What is the highest level of minor league baseball? In what year was the first MLB All-Star Game played? Which team won the first modern World Series in 1903? In which city was the first All-Star Game played, at Comiskey Park? What happens on April 15 each year in MLB? What is the home run celebration feature at Citi Field that rises from center field?