What caused anti-western movement?

Answer 1

In the 19th and 20th centuries, the Western nations, predominantly more technologized, used their greater machine power to exploit the various less developed nations, typically withdrawing much of their Natural Resources at what many consider to be less than fair prices. The attempted - and somewhat successful - eradication of the less developed people's cultural traditions and beliefs was not met with favor, either.

Nor were the mass deaths of many civilians, at various times, when the local governments were not found pleasing to the Western powers.