What are the pros and cons of colonialist policies for the metropolises?

Pros:

1. Opening new sales markets, expanding trade;

2. The influx of minerals, rare and valuable goods into the metropolis;

3. Expansion of the sphere of influence of the metropolis in the international arena;

4. Possibility of exploiting the inhabitants of the colonies.

Minuses:

1. The need to maintain military contingents for protection from both external and internal enemies;

2. Possible clashes with other countries fighting for colonies;

3. Uncontrolled influx of labor from the colonies, growing tensions, rising crime.