Which weapon was key to Kublai Khan defeating the Sung dynasty?

Historians are concerned with the accuracy of their writings and readings but are also aware of the inability of authors to know every angle of every story biases, perspectives, beliefs, and a variety of other differences history being told by one person at a time no one being totally accurate, as hard as we try really need on this, and you^^

Describe hiw the meanings of the constitutional clauses that grant powers to congress have been defined

What religion influenced the first persian empire as established by cuyrus the great?