I'm not sure what you mean by 'colonize', but there are plenty of countries that have had governments installed by foreign powers. Why do you think the US still maintains a troop presence in Iraq and Afghanistan? To ensure that the people there don't rebel against the puppet governments.
Iraq is an interesting case, the US empowered certain militias (warlords) and corrupt politicians who crushed political dissent through the mass imprisonment of people who oppose them. Another example is Bahrain, where demonstrations against the puppet government there were crushed by moving Saudi tank battalions into the country and gunning down protesters en masse. Of course, you won't hear about things like this is the mass corporate media, so there is virtually zero public awareness for what is really going on.