There is often a gap in levels of development between richer developed nations and poorer developing nations. This development gap can be influenced by a variety of factors including physical geography, access to resources, historical experiences, cultural practices, economics, politics, and debt levels. For example, landlocked countries may lack natural resources and face physical challenges like natural hazards. Former colonies were sometimes left in political and economic turmoil after independence. Civil wars can destroy infrastructure and displace populations. These multiple intersecting factors all contribute to differences in levels of development between nations over time.