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These do belong separately though clarification would be helpful. Looking at the relevant articles:
National liberation movements: Wars of national liberation are conflicts fought by indigenous military groups against an imperial power in the name of self-determination, thus attempting to remove that power's influence, in particular during the decolonization period. They really aren't trying to secede as much as free themselves from foreign control, though sometimes people claim they are secessionists, especially if colonialists do control "democratically elected" puppets acting as surrogates, the modern way. However not ALL national liberation movements are violent, though the ones in wars of national liberation may be, so the description of that category should be changed.
Independence movements (individual articles) may include national liberation movements, as well as movements to withdraw from a long standing indigenous political entity, as well as groups calling for independence (or secession) as a strategic threat in working for more autonomy or more resources within the nation. However, the goal might be Partition (politics), like Czechoslovakia agreeing to part into Czech and Slovak repubics. It is not necessarily secession.
Secession is an act to with draw from a nation and a strategy which may be used by either movement above but may not be. So lumping movements that make secession a central and actual goal with those which just use it as an occasional threat can be confusing. CarolMooreDC (talk) 00:35, 28 October 2009 (UTC)