First off, I didn't forget any of the bands you mentioned. I just chose not to list them, except for Cream, I did in fact mention them in my post.
Secondly, there's no way in hell that the bands you listed can hold a candle to the bands of the British Invasion.
Seriously, just list off your Top 5 favorite American bands and I'll list off 5 British bands that are better. (Obviously music choice is an opinion, but I'm speaking more in terms of cultural significance, success, what they did for music, etc.)