I just need to know how to grade school system in the U.S on comparison to that of Nigeria. For example, we kindergartens, primary 1, 2, 3...6, and in secondary, we have JSSS 1,2,3 and SSS 1,2 and 3..

I know in the U.S they use grades like grade 1,2,3 etc. I just want to know which the equivalence comparison between both. I.e
Nigeria | United States
primary 1 = grade what?

Thank in anticipation for your response