The clause was demanded by congress in order to prevent any claims that may have flowed from either Spanish rule or Mexican rule of the lands prior to the treaty of Guadalupe Hidalgo.
baloney and you know it.
Well, I have made an assertion. If you care to refute it with facts, please do so. Calling it baloney does not do anything more than show you have an opinion that differs. Please feel free to site your sources. If you can show that my facts are in error, I will gladly refute them myself.