Explain some of the consequences of the declining populations in the country like south korea and japan.

 A declining population poses serious labour deficiency problems in an economy.
It also strains the economy as more and more of the population become dependent. They either depends on social security fund or on their relatives.

Population decline also decreases investments  in the countries as it diminshes the market for goods and inhibits new ideas.

Answerbecause of improved transportation, communication, and other advantages;

Europe needs to build a trump-like wall that will spread across europe making it impossible for migrants to cross they need to spread pig guts all over this wall so the muslims will never consider crossing into europe..you might be asking "can't they just fly over with planes? " well yes they can so we will install thaad missile protections system to shoot down any aircraft that violates europe's air fourth would be to start a fourth reich in germany.. last but not least.. make europe great again!