なぜなら～

This is due to the fact that we didn’t have enough time to prepare.
The reason for the delay is that the equipment was not delivered on time.
The decrease in sales can be attributed to the rise of online shopping.
The cause of the problem is a faulty connection.
One explanation for the discrepancy is the difference in measurement methods.
The increase in traffic results from the new highway construction.
The rise in unemployment is a result of the economic downturn.
The conflict between the two countries stems from historical tensions.
The misunderstanding arose from a miscommunication.
The error in the calculation is caused by a typo.