Niagara falls is in NY, USA and in Canada. If you live in the US you do not need a visa to see it. If you want to cross the border from the US you will need documents including your passport.
no
Surely
can nigerian passport holder with spanish resident permit need a visa to visit ecuador.
no
No
Does not matter if you are a US Green Card holder or not, when you have an Australian visitor visa, you can go there.
A B1 visa holder can typically stay in the US for up to 6 months per visit.
A visitor visa holder can typically stay in the US for up to 6 months per visit.
Yes, all west Africans need a visa to visit Australia
usa
yes
Yes.