QUOTE(Lampshade111 @ Mon 25 Aug 2008 0656)

While I forgot to mention them, I was also talking about the Romans, who to my knowledge did not use any composite bows.
"Romans" cover a lot of time and ground. Some of the Byzantine cataphracts might have had composite bows. Also, most "Roman" archers were auxiliaries, and not that much is known about them, at least by me.
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I knew that outside of Britain during the middle ages bows were not used to a very large extent but I was unaware this social barrer was that much of the factor. Wouldn't the use of the crossbow become much more widespread durig the late middle ages however?
Crossbows are much more expensive and harder to produce and tend to come under the "supplied by monarch or military contractor" rule. Again, the rulers did not want new techology that threatened the existing order -- at least until the people overthrowing the existing social order were monarchs trying to build nation-states rather than try to control feudal mobs.
In 1347 a Pope pronounced crossbows to be anathema and excommunicated all crossbow users. Like most weapons control measures, it didn't work.
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In regards to gunpowder, yeah the peasant would need to be supplied by the king but together with the pike it did shift the balance of power on the battlefield further away from the elite knights and calalry weakening the nobility as you have said.
Speaking of pikes was there any social reasons as to why it took so long for pikes and similar long polearms to become common on the battlefield in the face of heavily armored cavalry?
Once again, warfare was a sport of nobles, and they didn't WANT effective infantry -- it threatened their power. Note that the "Renaissance of Infantry" was led by rebelling Dutchmen and the monarchless Swiss. The Spanish took it and ran with it with their tercios, but I doubt they could have afforded it without the Crown being financed by American loot.
Practical reasons for slow development of polearms is that they are pretty useless in any context other than massed employment by large bodies of troops. They are also expensive (Try to find a good fifteen-foot piece of ash to make a pike) in a milieu where "infantry" are peasant levies armed with agricultural equipment. Once again, it took a pretty powerful monarch to afford to pay for blocks of pikemen. They couldn't just be slapped together.*
* It's "fantasy," but Elizabeth Moon's
The Deed of Paksennarion has a pretty good description of the training involved in getting good pike units.