I would like a web site with statistical abstracts for all major
league baseball teams starting from founding. I need win loss records
for all teams.

All of the following sites have all-time win-loss records for MLB teams: 

http://www.billy-ball.com/All-TimeTeamRecordsthrough2005.htm
http://www.vagrantcafe.com/forum/showthread.php?t=20093
http://mcubed.net/mlb/fwtot.shtml
http://www.battersbox.ca/article.php?story=20060615093105122

You'll have to compare them to see if they match up (I believe one of
the sites didn't include wins when a team was located in a different
city).

If you don't find this information helpful, I'd suggest going to a
bookstore or library and just looking at a baseball encyclopedia.

Have a good day.