You can start with this website http://nigeria.usembassy.gov/ A letter of invitation is usually advised. They may also need to show strong ties to their country, such as family, a job, home, a bank account.
Quick Answer. Over one billion Muslims live in Asia, which makes it the continent with the highest Muslim population. Indonesia is the country with the largest Muslim population, with 209 million people. Continue Reading.
Muslims make up less than 5 percent of the population in most European countries. France has the largest Muslim population in Western Europe. An estimated 4 million to 6 million Muslims make up between 6 percent and 10 percent of the French population.