what are the horizontal and vertical divisions of power enumerated by Robert Leider and found in the constitution?

Write a brief, three to four-page essay that examines the war powers under the U.S. federal constitution. At stake here are three principal questions: First, what are the horizontal and vertical divisions of power enumerated by Robert Leider and found in the constitution?1 What are the main checks and balances in this system? And, taking into account how they changed over time, what are the distinctions between an army and a militia? Note that, depending on the question, you might also consider the colonial era military system and the Articles of Confederation, in addition to the settlement found in the constitution.
This is an historical essay, and therefore you should be employing historical methods and accounting for change over time. To answer the several questions above, you will need to draw from primary and secondary sources, which is to say, respectively, the constitution itself and Leider’s essay. Note, as well, that while you may read any other primary and secondary sources, you are permitted to quote only from the two assigned texts.
Please if possible I would like to be able to have this done by the end of the night