Why is Brain Drain negative for the country of origin? Support your answer with few points. Each points must be briefly explained.

The departure of skilled workers can weaken developing countries, especially smaller ones, by depriving them of important skills and workforce. ... Brain drain is also criticised for producing a fiscal burden on the country of origin as it loses out on the skills of a publicly trained and educated workforce.

the only other powers were germany russia and uk and they were too busy fighting each other wearing each other down   that the us was becoming strong and they were becoming weaker