Sharon Jayson, "What's on Americans' mind? Increasingly, 'me'", USA Today 7/10/2012:
An analysis of words and phrases in more than 750,000 American books published in the past 50 years finds an emphasis on "I" before "we" — showing growing attention to the individual over the group.
This is actually true as stated. If we take the counts from the "American English" unigram dataset in the Google Books ngram collection, and extract the year-by-year counts for the letter strings in question, the frequency of "I" has increased relative to the frequency of "we" over the period since 1960 — to the point where the ratio of frequencies is almost as high as it was in 1900: