Why did Sumerians go to ziggurat

Who was the democratic nominee for president in the election of 1868? a) ulysses s. grant b) horatio seymour c) samuel tilden d) charles sumner

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^^

When conducting research for forming a hypothesis, which practice should historians follow?