Imperialism is the domination by one country of the political,economic or cultural life of another country or entire reigon. It is similar to what the US does in the middle eastand Persian golf. They needed raw materials. They needed iron, copper, coal, rubber, oil. They wanted new markets to sell their stuff.They needed military bases to have their troops and have them ready to go. For nationalism and pride. They wanted to convert natives to Christianity.Some people wanted to do good things.
There are many different forms of Imperialism. One form is direct rule in which countries would send large military forces and control every aspect of a country. Another form is in-direct ruleis they would use local rulers such as chiefs. It was the British policy.British would send educators to teach people British ways.