Question: why do nigerians hardly get access to other countries like USA,Spain andd other international countries? 

Answer: They do. They spend most of their time perpetrating various scams using the internet, Western Union, FedEx and UPS.  If you ever come across a Nigerian online, watch out. They are trying to scam you out of money.  Nigerian scams are the top source of income in that country.
This question from the Yahoo Q&A forum is categorized in the topic: Business & Finance