The reason for this decentralized approach is mainly due to scale.

Due mainly to these pressures, the President resigned the same year.

That is due mainly to the strong growth in long-distance, which we expect to continue.

They said poor maintenance was due mainly to a lack of money.

This was mainly due to conflict between the views of the two people holding the office.

The rivalry between the two schools is due mainly to proximity.

Development has been slow, due mainly to struggling economy in the state of Michigan.

This is mainly due to support granted by state for such activity.

What attention the race has been getting is due mainly to the proximity of Connecticut.

The drop is mainly due to push factors in the areas of origin.