The most likely reason is to prevent the president from abusing its power.
Hope this helps:)
The animal that changed their ways was the horse.
It has steadily declined. The unions are not used nowadays at all. In the 70s approximately 35% of people were unionized. In 2013 only 11.5% of workers belong in a union and fight for workers rights. Unions strength has weakened because people are not interested in them.
