Beginning in the 16th century, European powers such as Great Britain and Spain controlled and exploited far-flung territories by colonizing them. This rush to conquer and dominate land and resources uprooted and disrupted the lives of people throughout the world. Although the colonial era largely ended with national liberation movements in the 1960s, nearly four centuries of foreign control left their mark on many developing countries.

Better Health and Education

Colonial powers introduced Western schools and healthcare, resources that often had a positive effect on the lives of the colonized people. Government schools typically focused on training for low-level civil service occupations. In many African colonies, missionaries shouldered much of the responsibility for educating the masses. Although fewer than half of the children in most colonies went to school, many of the leaders of national liberation movements who went on to lead post-colonial governments had been educated in colonial government and missionary schools. Where colonizers established medical centers, they succeeded in lowering infant mortality and promoted vaccination and disease prevention.

Political Strife

In many territories, colonizing powers created centralized governments where none existed before. The colonizers, however, created political borders that served their own needs rather than reflecting the historical territorial divisions of the people who lived there. Suddenly, many ethnic groups that had never worked together were forced to do so. At the same time, some groups found their traditional territory divided by a political border between two colonial countries, fracturing ties between extended family and kinsmen. As a result, colonialism created large, ethnically fragmented countries prone to civil wars both during and after the colonial era.

Plantation Mentality

Colonial powers conquered distant lands in part to exploit their natural resources, and exerted complete control of the extraction and export of cash crops and minerals -- often with little regard to helping the people native to the area. In agriculture-based colonies, a plantation economy developed, such as the coffee plantations of India and modern-day Sri Lanka. Plantation owners exerted strict control over the native people they hired to work there, often in deplorable conditions. In Southeast Asia, colonialism did have the positive effect of European investment and construction of canals and irrigation systems. African territories also saw roads and other infrastructure as a result of colonialism. However, such progress came at the expense of harsh treatment by the colonizers.

Traditions Lost

During the colonial era, many European colonizers, such as Great Britain, took a paternalistic view of the native culture. They saw themselves as acting in the best interests of these people, bringing them Christianity and civilization. This attitude destroyed traditional beliefs and social values, however, and had a negative effect on colonized populations. Some groups attempted to curry favor with the colonizers by converting to Christianity and renouncing their traditional beliefs. Converts often acquired special military positions or privileged tasks in colonial government administration. For example, the French preferred to employ Vietnamese clerks and government administrators in Cambodia and Laos. Over time, colonizers often came to prefer certain ethnic groups in a colony over others, reinforcing or even exacerbating ancient ethnic tensions.