- There are seven billion people in the world compared with less than two billion in 1900. Some are much better off economically and in other ways than others. The less well off try to improve their circumstances, either where they now live or by moving to better (wealthier) countries.
- The world is divided into countries which are artificial entities administered by governments which have established rules for who may reside in a country. They try to get other countries to agree to these rules. Most of them do, but there arise problems of enforcing the rules which deal with things like approved migrants, temporary foreign workers, tourists and refugees.
- Enforcement is weakened by a combination of greater information about conditions in different parts of the world (reduced communication costs), reduced travel costs, and the willingness of people to take personal risks which may result in death.
- The concept of a sovereign country that can enforce rules about the crossborder movement of persons is being seriously undermined, and may lead to governments attempting to control their borders by force.
- The conditions surrounding the present (2015) flow of refugees is sufficiently different from similar past flows that it requires new thinking. Previous empires, Roman, Ottoman and Communist for example, contained the seeds of their own destruction, so capitalism and democracy, as practiced in different parts of the world, may have similar seeds germinating.
- One more specific comment on today’s situation in the Middle East. Many point to the causes of unrest as arising from the Sykes-Picot agreement about the establishment of boundaries at the end of WW1 re Iraq, Syria, Lebanon, Palestine and Transjordan. Underlying this agreement was the demise of the Ottoman Empire which had lasted for around 600 years. An excellent BBC documentary (available on the Internet) examines the Ottoman Empire and is worth viewing). Past history and modern conditions appear to me to be causes of the present flows of refugees.