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I found this article and I wanted to post it here. It has a historical overview on Bolivian revolutions. Most of all, it has references to two recent books on Bolivia.
It concludes on "We’ll have to see if the current stalemate leads to new political mobilization in Bolivia. If things do heat up and take a new radical turn, we might see the US administration adopt a more aggressive role. I don’t see this as imminent, and any such move would depend on the balance of forces in the region as a whole. In the meantime, the US government will put up with Morales, count on him to behave himself, and continue to provide low-profile support for right-wing opposition."