Answer:
refer to this site
Explanation:
https://books.google.ae/books?id=cjqSAAAAMAAJ&pg=PA6&lpg=PA6&dq=do+regions+unite+or+divide&source=bl&ots=74j75ItXO2&sig=ACfU3U0BosthmiXBDW4zEr9TJIS-wcP5PA&hl=en&sa=X&ved=2ahUKEwjkz4a0lJfnAhWIGBQKHTAiCG4Q6AEwAnoECAgQAQ#v=onepage&q=do%20regions%20unite%20or%20divide&f=false
