How did the policies of ruling governments policies prevent colonies from developing their own economies?

The colonies cannot manufacture their own goods and cannot enter into trade deals with other nations.

Explanation:

The following are the factors for which the policies of the ruling governments prevented their colonies from developing their own economies are  :

1. The colonies are forced to sell their raw materials for the various products to the parent countries.

2. They also have to buy the manufactured goods from the parents countries.

3. They cannot manufacture their own products and goods.

4. There are various laws that imposed strict restrictions to the creation of any local industries and also prevented them from entering into any trade deals with other countries.

world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

explanation:

the deaths of over a million communist soldiers

post-traumatic stress disorder in veterans