Well, the US showed that they belong, if only barely. France played a shaky match until Poland just had no legs left. I still think with Pogba and Benzima they're 50/50 favorites with Brazil. Maybe even more. England was a superior team to Senegal plain and simple. People trying to draw all these conspiracy theories out their ass don't know shit about football. Ask Germany. In round-robin competitions, it's the draw that makes or breaks you 75% of the time. If you come out of a weak group the knockout stage is sure to have a heavyweight waiting for you. And vice versa if you're in a group of death - you may not make it out.
And, no, nobody thought Nigeria was ever going to be a soccer power in the 90s or any other time. Côte d’Ivoire maybe but not Nigeria.