Because it is a part of the religion of Islam.
The development around the world is measured by using several different methods. Mostly these methods include the GDP, GDP per capita, industrialization, freedom of speech, level of corruption, type of economy, availability of institutions to the people, healthcare, availability of resources etc. All of these things combined are able to provide us with a fairly accurate picture on the level of development of a particular country. Some countries are well developed, some are transitioning, while some are with very low level of development. The countries that are well developed often put effort to help the countries that are not developed, and they do this by providing finances for capital projects, making trading deals with them, sending experts in certain fields to help with the development and education.
