By single entry they said does it mean that after applying ones and successful the person might not apply again in the future if they wanted to visit the country again?, if this is what they meant is very wrong and this is somehow saying they don't need a nonimmigrants from Nigeria because is very obvious, something that's usually approved to be valid for years has now been kept for few months, which means that those who might be thinking about acquiring the United States citizens from nigeria will be very difficult for it to get approved, this is a sad news for the people who loves traveling to united states.
The United States is trying every possible means to ensure they're having a safe path toward restricting Nigerians from crossing boundaries. President Donald Trump have made his intentions known and he wouldn't be jeopardizing his power when he declares against a particular feature. Who else can understand the leverage that comes with Nigeria non-immigrant visas? It will affect most of the general settings to acquiring a visa.
The earlier one start thinking about making other plans to flee the county because president Donald Trump wouldn't be given a single chance to violators, deport them on the spot and permanently imposing a strict harsh ban towards these offenders. United States looking to surpassed the rule where visitors become more vast in numbers.