Everything cited in the articles refers to actions that Musharraf took while in office that are considered impeachable actions:
QUOTE
charges that include illegally suspending the Constitution and imposing emergency rule last November and wrongly dismissing nearly 60 judges under that decree
So apparently he single-handedly suspended their constitution, instituted a military rule and used that period to dismiss 60 judges.
I don't think this has any direct link to the US involvement in the region. While we may not be the most popular country, we are not the cause of every international crisis.... only most of them.