How can the president prevent a bill from becoming a law?

The President can veto a bill indirectly by withholding approval of the bill until Congress has adjourned sine die. This informal way of preventing a bill from becoming a law is called a pocket veto. When the President issues a veto, the bill returns to its House of origin.

Explanation:

depending on what kind of map for example a pltical maps works in many ways this iss how it works it shows the areas and places the democratics and the repbulcicans reside for example if   texas chooses trump for president there a republican state and if   califronia chooses hillary there a democratic state.