If not "colonized" what do you call it?
There's a visa for everyone to live here, either legitimately, or through an agent.
Do you know about Thailand's proud military battles over the centuries? They just gave away their land to avoid conflict. Yes, so proud.
Down the road, in Vietnam, different story. Fought off the Chinese, the French, the Americans, and then went into Cambodia and liberated the people from Pol Pot.
You have no idea.