According to the Governor of the state Republican Mike DeWine they were invited by the companies that were on the verge of going under because they couldn't get enogh born there locals to apply for the jobs. As a result the town was pulled back from financial collapse and is now booming and there has been a sharp rise to property values, As far as being invited to the US that had already happened and maybe was due to the history of 2-3 decades ago that you state. Although to me it sounds more like your just adding your own spin to the story.They were ‘invited’ here by the current government not the citizens of the town. The reason the government ‘invited’ them is 2 fold. Our government has overthrown their democratically elected government at least once, sold their assets including children to the Clinton Foundation(who siphoned off billions in aid in the process) and pressured the UN to send in the Nigerian army to police/strong arm the locals(including mass rape and pillaging). Their democratically elected president was unceremoniously spirited out of the country under the cover of darkness at gun point by the state department. And of course replacing workers in Springfield with people who will work for long hours for next to nothing(including children) and not know their rights as workers in the US system. Other than that, yeah, they are here legally and were ‘invited’…