Militarization’ of the USA

Before World War 2, the USA normally had small military forces, and spent little on the military, and was not often, nor for prolonged periods, involved in wars. But, even though the USA totally won WW2, after 1945, the USA has never returned to a ‘normal’ peacetime status: its military is permanently HUGE, and costs are also HUGE, and the nation is almost constantly involved in war, directly and indirectly, all over the planet (which was not the case before World War 2). 

QUESTION:
Why, since 1945. has the USA become a military nation?
What have been, and continue to be, both the effects (good and/or bad) of this ‘militarization’ of the USA?

This is my major course final essay I need a high quality paper and it should be all your own opinions of these two questions. don’t copy and paste from the internet or other resource because it will turn it in the website turnitin.com and it will check the plagiarism. And again, read the instruction and the questions carefully and write this essay correctly.