Some Economic Impacts of Imperialism (4 at least)

The economic effects are that various European and American powers became immensely wealthy and became even more powerful; the British drained and exploited all the wealth and riches of China for more than a few centuries alone-essentially enslavement.

India as well being a colonial territory of the British for also 200 years was exploited and made the British rich beyond imagination.

Other European and American powers did the same did all over Asia to every Asian country ... the colonized countries of course suffered.