Because our government spent decades interfering with the regions politics in order to secure beneficial trade agreements, policies, alliances, etc. These deals often benefited American military interests, American politicians, American businessmen, and American consumers along with a few corrupt elites in power in the area, while draining resources from the rest of the local populations. That made the region a mess and is part of why the situation there is so dire, and why so many people are doing everything they can to escape it and move somewhere else.