The death of Kublai Khan in 1259 marked a major turning point because up to his death, the Mongol Empire was more or less constantly expanding. However, with his death, things started becoming worse and worse eventually as the empire became to big for one emperor to hold it.
Because he discovered the new world in 1492
There are many ways God shows us His love, one of the biggest being that He sent down His only Son to die for our sins. A few others are giving us forgiveness no matter what we do as long as we repent and ask for it, and the blessings He gives us in our everyday lives. Hope this answers your question, God bless you