the fulani leader usman dan fodio invaded nigeria from niger republic

And?

1900, there was no Nigeria, no Niger, no Cameroon and no Chad, all were creation of the colonial masters.

What there was is Sokoto caliphate that spans alarge swath of land from Adamawa to the fringes of Mali, some parts of Ghana and present day Niger republic, Borno empire that at a time spanned uptill the fringes of Libya from Maiduguri.

Learn basic history.

We are waiting for them in Igboland. They should drop Koran into the Atlantic via SW