How many U. S. states employ a winner-take-all presidential election system in which all their electors are awarded to the presidential candidate who wins the most votes statewide?

48 out of the 50 States

Explanation:

Since 1996, Maine and Nebraska are the only two states, out of 50 states who are not practicing the winner takes all system, which a section of democrats and the republicans alike see as undemocratic. In the 48 states where this system is effective, all the electors are rightly given to the person who wins a majority of the popular votes in those states without considering how wide or narrow the victory happened. This system is not mandated by the constitution and can be changed without going through the various process of constitutional amendments.