Explain the similarities and differences between pigeonholing a bill and exercising a pocket veto.

In the U.S system, the President was ten days to decide what to do with a bill passed by  Congress. If he signs it, it becomes a law. If he vetoes it, it goes back to Congress, which can override the President's decision and still make it a law if two thirds of both houses agree. But if the ten days goes by, the President hasn't make any with the bill and the Congress adjourns before the ten days is up, the bill is vetoed and cannot go back to Congress, so the President can't be overrode.

A pigeonhole is when a bill is put aside for a better time to pass it or to kill it.

the effect of the ming leaders banning ships with more than two masts was that there was no further construction of ships masts, because there was a surplus. ming emperors disallowed foreign exploration