The motivation for invading Afghanistan was to build an oil pipeline from the Caspian Sea to the Indian Ocean. Talks with the Taliban broke down a few months prior and the plans were drawn up for the invasion.
Those plans were then followed when a decent enough excuse to do so was allowed to occur. This is why Al Queda were able to escape en masse to Pakistan.
The motivation for invading Afghanistan was to build an oil pipeline from the Caspian Sea to the Indian Ocean. Talks with the Taliban broke down a few months prior and the plans were drawn up for the invasion.
Those plans were then followed when a decent enough excuse to do so was allowed to occur. This is why Al Queda were able to escape en masse to Pakistan.