I've been reading a number of books on the origins of the Cold War because I really believe that it was the post-WW II period that set us on the path we're on today: militarism, empire, and lessening democracy and devotion to the Constitution at home. For a truly excellent description of "the path we're on today" read Chalmers Johnson's new book Nemesis: The Last Days of the American Republic. This is a book many will find difficult to take seriously but I find it very convincing; and Johnson is no knee-jerk radical, he worked as a consultant for the CIA for a number of years and has been a respected academic for many years.
At any rate I've been reading John Lewis Gaddis' The United States and the Origins of the Cold War. Gaddis is considered the primary 'respectable' authority on the Cold War and indeed his book is very well written and researched (I'm reading the original 1971 edition.). Gaddis began with a Preface in which he explained that he was going to look at foreign policy through the eyes of those who made it. What he failed to say was that this principle applied primarily to American policymakers and not their Soviet counterparts. One of the things this means is that America's commitment to "self-determination" for all peoples, as announced by FDR and Churchill in the Atlantic Charter of pre-Pearl Harbor 1941, is taken at pretty much face value. This is important because when the Soviet Union's armies, which fought the Nazis with little manpower help from England or the US for about three years and lost 16-20 million in doing so, wanted its own sphere of influence in Eastern Europe (through which it had been attacked three times within 130 years), the U.S. found it necessary to stand for the "self-determination" of Eastern European countries.
Gaddis finds it difficult to fully acknowledge that most of our talk about "self-determination" was disingenuous propaganda because acceding to Churchill we excluded most of the British Empire from self-determination and in our own history had amply demonstrated our hypocrisy re "self-determination". For evidence of the latter think of Cuba, the Phillipines and Puerto Rico in 1898, Cuba in 1960-1, Iran in 1953, Guatemala in 1954, French Indochina (Vietnam) in the 1954-1974 period, Chile in 1973, etc. etc. etc. (Read Stephen Kinzer's book, Overthrow.) My belief is that historians ought to attempt to be as objective as possible but most of the American history I read is "patriotic" history.