Why did the Framers—the men who wrote the Constitution—give the President such limited formal powers?

Framers were too afraid that a very strong central government would bring up dictatorship. So, in order to restrict the authority of the central government, the Framers decided that in the Constitution, certain powers were denied in the Federal government.

honestly i really it keep confusion down on some sides

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".