Why might states feel the need to form compacts with other states

The need to form compacts with other states:

They make compact agreements with other states because they wanted to achieve together and what the neighbouring states having the problems of doing alone. They make the contract for the sharing enforcement data and the development of the water, oil, wildlife.

They believe the full faith and credits clause of the constitution and require each states to honour and enforce the laws, official documents and the court ruling of other states. The states of the compacts to form one to another to have the relationship with the other states.