Imperialism which is often considered to be a final stage of capitalism was a logical continuation of industrialization, development of trade and colonization. Global trade and goods exchange have united Europe, Africa, America and Asia into an integral organism. Imperial system as well as interaction between the major colonial super-powers guaranteed economical stability and peace. Colonies were perfect markets for the goods produced in metropolises and were used as emergency zones in cases of overproduction in order to prevent global or local economical crisis. .

             Colonies were used as raw material donors of metropolitan industry. In order to prevent movement for political and economical independence, colonies were not allowed to have industrial objects as their economical activity was limited to farming and mining. On the hand with traditional colonial system which took place in France, Great Britain, Belgium which had huge possessions worldwide, American imperialism had introduced a new one without any formal colonial possessions. American imperialism was different from British and French as it penetrated into independent countries, making their single-sector economies be dependent upon the price policies set by American corporations. American imperialists used different methods in order to widen their spheres of influence in western hemisphere: bribery of corrupted officials, aiding political opposition of unwanted regimes and even open intervention by American troops which always ended with establishing of puppet governments. These methods were used on Philippines, Cuba, and Puerto-Rico.

             The effects of imperialism are quite different both for colonies and imperial metropolises: from one side goods exchange ensured economical stability, from the other side imperial ambitions of superpowers resulted WW1. Colonies experienced mostly negative impacts: industrial backwardness, dependence upon metropolises, poverty, social injustice and discrimination.